050820121030:
I have use the search button to see how i can lower screen brightness on galaxy note.
i found everywhere mentioning screen filter, it is not i don't like screen filter, but when i take screenshot it will be tinted gray.
so i decide to go to a more elegant way like what atrix 4g user did.
http://forum.xda-developers.com/showthread.php?t=1245332
i tried with my note, i cant find sys/bus/i2c/drivers/lm3532, i decided to check folder with the nearest name, but i can't find it.
so i decided to download linux, mind you i have no idea how to use linux.
i downloaded samsung ics opensource update 4, inside i can't find leds-lm3532.c,leds-lm3532.h,board-mot-lights.c.
so futhur dig found leds-lm3530c, the file structure is different with leds-lm3532.c, but i think it works the same.
any good suggestion from experts?
edit1 050820121203:
I decided to check what AdjBrightness do.
it is modifying the following files
/sys/class/leds/lcd-backlight/brightness
/sys/class/leds/amber/blink
/sys/class/leds/amber/brightness
/sys/class/leds/green/blink
/sys/class/leds/green/brightness
all return errors in note.
further investigation leads to Rootdim:
/sys/class/leds/leds-sec/trigger
/sys/class/leds/leds-sec/brightness
/sys/class/leds/leds-sec/mmc1::/trigger
/sys/class/leds/leds-sec/mmc1::/brightness
/sys/class/leds/leds-sec/mmc2::/trigger
/sys/class/leds/leds-sec/mmc2::/brightness
here all the triggers return error.
next thing i check /sys/class/
i see backlight/panel in it.
i also see lcd, leds and lightsensor.
have no idea, keep digging.
100820120935:
Found s6*aa*.c files inside driver folder.
There will be some info about 5.3inch screen.
Deeper search found that it only suplort 24 stages of brightness
From 0,1 to 30 is 0
Conclusion minimum brightness for galaxy note is 1(more than 30)
Keep digging.
100820121808:
s3cfb_s6e39a0.c contain brightness level from 1 to 24.
100820121815:
AMS529HA01 is samsung 5.3 inch galaxy note panel
s3cfb_s6e8aa0 -- the one we are using.
the following files also related to the above file.
s3cfb_s6e39a0
s3cfb_s6e63m0
s6d6aa1
s6dr171
s6e8aa1
smart_dimming
midas-lcd
setup-fb-s5p
the whole thing means samsung have tried other lcd before hd super amoled 5.3 inch?
keep digging for the brightness
150820121820:
End of research, the brightness for amoled devices only have 24 levels.
lower than that you will need to adjust contrast for better battery consumption.
if you use filter it wont decrease battery consumption, and it will affect your screenshot images clarity.
1609120512:
https://sites.google.com/site/androidnothize/no-dock/input-device-and-backlight
this shows you minimum brightness level is 30
http://forum.xda-developers.com/showthread.php?t=1709686
search for min_bl
http://forum.xda-developers.com/showthread.php?t=1154278&page=617
curve?
http://forum.xda-developers.com/showthread.php?t=1576355&page=222
N.E.A.K
So, what's the verdict? Are we stuck with "too bright in the dark" screens on our Note's?
d210 said:
So, what's the verdict? Are we stuck with "too bright in the dark" screens on our Note's?
Click to expand...
Click to collapse
For that purpose a screen filter works just fine for me.
Frankly it's not doing it for me, it looks like I'm looking through a grey plastic bag.
Andrew0811 said:
150820121820:
End of research, the brightness for amoled devices only have 24 levels.
lower than that you will need to adjust contrast for better battery consumption.
if you use filter it wont decrease battery consumption, and it will affect your screenshot images clarity.
Click to expand...
Click to collapse
So what is conclusion bro?
We can't use brightness below the SYSTEM-MINIMUM?
I also want more battery by reducing brightness to below 10.
AND yes you did well.
Good research.
Nexus 5 Calibration:
Welcome to this thread: This thread is all about colors and displays. Nexus 5 only though!
- “Easy part: Apps, profiles” is for those that just want to mess around with some of the user created profiles and then move on. You can find the frequently asked questions about the profiles here!
- “More technical part” is for those who are more interested in this topic. Reading this part is recommend before calibrating.
- “Calibration” is for those who want to create a profile themselves (requires colorimeter or spectrometer).
- “Testing without a colorimeter” is for those without a colorimeter, but are still anxious to mess around ^^
- “Current state of development” shows the questions we don’t know the answer to yet.
Click “Click to show content” to extend the information!
Easy part: Apps, profiles
How do I get a color calibration app?
Make sure you have a compatible kernel first, like Franco's
Either use:
Nexus Display Control (Free)
FKU (paid)
Faux123 Kernel Enhancement (paid)
Kcontrol (paid)
How do I get profiles?
They are pre-installed! Just tap:
FKU: Color Utils - Load a color profile - Import preloaded profiles
NDC: Load a color profile - Import preloaded profiles
Faux: No need to do anything!
KControl: Not available
Newest collection of profiles.
Link 1 (Be sure to give a thanks to @vomer)
Link 2 (Be sure to give a thanks to @The Gingerbread Man)
If you download a new profile, you have to put them in a specific location:
FKU: /franco.kernel_updater/color_profiles
NDC: /nexus_display_control/color_profiles
Faux: /com.teamkang.fauxdisplay/profiles
After this, you can select and apply the profile.
How do I apply a profile?
Nexus Display Control App or Franco Kernel Updater App:
1) Tap 'Load a color profile' (Under color utils in FKU)
2) Select your profile
3) Hit Apply
4) Turn screen off and on to view result*
FauxClock:
1) Color/Gamma – Gamma Profiles
2) Select your profile
3) Hit Apply
4) Turn screen off and on to view result*
KControl: Not available
* On some kernels not required
Which profile is the best?
There is no best profile unless you buy a colorimeter. Here is why:
Every display is different, so the profiles that are perfect for one display will probably not be as perfect on your display.
Everything is subjective: You might like a more blueish screen, you might want accurate colors. All depends on you what is perfect
Even if you have a seemingly perfect profile, you can't test it without a colorimeter
How do I test my profile?
This is a tricky question. I have tried to develop ways to test a profile without the use of a colorimeter and I failed. It's impossible. You will never know the exact gamma, color temperature, etc etc.
There are things you can test however! Move on to part: Testing without a colorimeter!
But if you do have a colorimeter, check out: Calibration (requires colorimeter)
I love this profile. How do I set it as standard?
Check the checkbox 'Set colors on boot' in the app. (It’s a slider in FauxClock)
Problems:
Help I screwed up! How do I revert?!
Rebooting the device resets the display to stock settings (unless you ticked ‘Set on Boot’)
Or load up the stock profile (in attachments below).
(If the previous don’t work, your issue is more severe. Reflashing kernel, rom should work. If not, you have a hardware issue. Google for more info or RMA)
I don't see any difference! Why?
1) Do you have root and is root applied to the app?
2) Did you turn your screen off and on?
3) Note that the differences can be small.
4) Clearing app data and cache can do magic.
If none of these solutions work, verify that colors do change with the profile "Test your settings" (Download below)
If the profile and app work, you should get a very blue screen. (Revert by rebooting or loading other profile)
If the profile doesn't work, please search thread first, then ask questions. Your question has most likely been answered already!
The app doesn't work! :crying::crying:
1) Verify you are using a compatible kernel! Franco/Faux/Elementalx are all compatible. There are certainly more compatible kernels. Just check in that kernel thread if the kernel is compatible.
2) Verify that you have root and that the app gets root.
Please search the thread before posting! Usually your question has already been answered 5 times.
If I want to load a profile, the app force quits. Help!
The profile is invalid. Redownload it or use another profile. If this doesn’t work, try clearing data and cache of the app.
More technical part: Gamma, color temperature and colorimeters
Definitions you must at least heard of
Luminance
Luminance is a photometric unit to describe the amount of light coming from the screen. It is usually measured in cd/m2 (also called nits). It is comparable to brightness, but brightness is the perceived luminance (so subjective luminance you could say). Example: A display with a luminance around 100 nits is not so bright in the sun, but very bright in the dark. The luminance in both examples is the same, while the perceived brightness is not.
Gamma
The eye has a non-linear response to light. To correct this, gamma correction is applied.Without doing this, images look too light. Increasing gamma, means increasing the saturation. More info
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Color temperature
Color temperature is basically a measure of the color hue of white light that is measured in Kelvin (K). When you increase the color temperature, the hue becomes more blueish, decreasing it will result in a more yellowish/reddish screen.
RGB
When you are looking at a digital image, you are looking at a lot of pixels that make up this image. Each of those pixels consists out of a three sets of RGB numbers. These numbers can range from 0 (black) to 255 (white). For example: 255,255,255 will produce white, whilst 255,0,0 will produce red. RGB values themselves do not say much. You have to tell in what colorspace there are. These different colorspaces have different gamuts. Webcontent and our display use sRGB.
Here is a RGB color mixer to get a grasp on RGB.
More info on gamuts
Saturation
The vividness of a color. This can range from black/white to neon like colors.
Contrast ratio
The contrast ratio is the ratio between the brightest color (white) and the darkest color (black) your display can produce. Our Nexus 5 displays usually have around 920 (based on various measurements I have seen).
Useful links for more information:
Wikipedia:
Luminance
Gamma
Color Temperature
RGB
Gamut
Saturation and more
Contrast Ratio
Cambridge in color
GammaFAQ by Charles Poynton (expert) (Might be a bit outdated as 1998)
ColorFAQ by Charles Poynton (expert) (Might be a bit outdated as 1998)
Some color math by Bruce Lindbloom
Saturation vs. Vibrancy (vid)
How LCD works (hardware)(vid)
What do the parameters mean?
In total there are 24 parameters (of which 23) are displayed. Each parameter controls the luminance of a part of the RGB range. All other aspects (gamma, color temperature, saturation, contrast ratio) are derived from that. As stated, each parameter controls a portion of the range. Shown in this image are the ranges:
Note that the ranges do overlap in certain values. This means that one RGB value can be controlled by two parameters. (But never three!)
Let's take parameter 11 as an example: Parameter 11 has a range of 144 to 202. These RGB values can be altered by altered parameter 11. Most affected by parameter 11 is RGB(175). This RGB value will change the most when altering parameter 11. Respectively, RGB(144) and RGB(202) will change the least.
Negative and positive?
Also you might have noticed, there are two arrays for red, two for green and two for blue. Why? It’s for more precision:
These two arrays get combined to form one resulting figure. It’s not as simple as 10 and 20 become 15. Therefore I recommend keeping the difference between the parameters small in order to avoid confusion. Also the negative and positive are not equal. 10 & 20 do not produce the same outcome as 20 & 10.
Overall it’s best to keep the same when calibrating initially. But when you need a certain luminance you can’t achieve when they are the same, divert them. This method works the easiest and you don’t lose track of your changes so easily.
The White Point
The White Point is an odd setting. It does not control the color temperature in any way, form of shape. It’s also highly doubtable that the LG devs ment the white point in the curves adjustment tools of Photoshop. Currently the exact function of it is unknown, but what we know is the following:
Although the range can be 0 to 255, it actually ranges till 63. After that it loops. (0=64=128=192 and 63=127=191=255)
It’s main purpose is to allow more control over the RGB curve. Instead of controlling ranges of RGB curves, the White Point is an overall setting that adjusts every channel and every RGB value.
The recommend setting is between 29 and 33 and the middle value is 31
What would be the ideal settings?
When you capture an image with a camera, you want to see the same colors on your screen as the colors in real life right? Well, that is called an accurate screen.
Though, a lot of manufacturers don't provide accurate colors. Why not? Because the masses like punchy colors with a higher color temperature. The truth is that we have become accustomed to those colors. An accurate display seems a bit yellow nowadays. But there is a way out! Once you experience a true accurate profile, the other profiles seem really blue. Like all the things in life, we get accustomed to it.
An accurate profile would contain:
Banding: None
Color Temperature: 6500K
Gamma: 2.2 - 2.4
Properly saturated colors (Automatically achieved with calibrated gamma)
Contrast ratio: Higher is better, but above 930 is already pretty good for our LCD displays
How accurate is stock?
Actually, stock is quite accurate in comparison to other phones. There is certainly room for improvement, but they definitely tried to calibrate our screen correctly. The color temperature is around 6500K (+- 300K). Gamma is a bit too low (2.0), but in comparison to other phones it is quite good.
I like the punchy colors, can I keep them?
Of course! Your display, your rules. Having a higher color temperature isn't necessarily bad, though you must compensate a little bit. The changed settings would:
Color Temperature: 7500K
Gamma: 2.3 - 2.5
Note that for compensation for the higher color temperature, you increase the gamma a bit. This also works the same way around for lower color temperatures. Also, the same things like no banding still apply
Calibration (requires colorimeter)
Requirements for calibration
A colorimeter (Like Xrite i1 Display Pro (recommended by Display Expert Francois Simond))
HCFR
Faux Gamma App or any other app that can edit these parameters (Like Kcontrol or FKU)
Microsoft Excel or any other sheet program (Like Libre Office)
Nexus 5 with compatible kernel
Time
At which brightness should I use to test?
Unless you use autobrightness, I recommend using the brightness you use the most. But, you have to keep using that brightness for comparisons of profiles. So pick a brightness to your likings, but be consistent! (And no auto brightness!). I usually use 100%.
Let’s get started!
Step 1: Preparations
1) Set the screen timeout to 30 minutes or longer.
2) Keep your screen on for 30 minutes at the predetermined brightness. You can use you phone, just don't turn your screen off.
(Your display needs to stabilize by warming up. If you were to measure in the first minute you will see that the results are quite different than after 30 minutes. To ensure proper calibration, one must warm up the screen for at least 30 minutes)
3) Make sure you have all the requirements listed above. Also download “Shades of Grey” to your phone and “Display Calibration Nexus 5 by yorici.xlsx” to your pc.
4) Extract the images from the file explorer to a folder on your phone. There are multiple versions. I suggest reading further first, but if you can’t wait, extract “Shades of Grey (Recommended).zip”
5) Connect your colorimeter to your pc and open up HCFR.
6) In HCFR: Press 'new' - Select 'View images' - 'Next'
- Then under 'Select a sensor in this list': Your colorimeter (Can be any name). Do not use a meter correction file unless you know what you are doing. - 'Next'
- Display Type: 'LCD White LED IPS' - Reading Type: 'Display' - OK
7) In HCFR: Go to Free Measures and make sure you have set the mode in RGB
Test if it works by pressing F7. It should have measured once now and you get a table of data with one row. If you click on it, you will see more data in the left pane below.
8) If your screen hasn't warmed up for 30 minutes now, just play a game or do something else. It might be useful to get a charger as you will have your display constantly on for the rest of the steps.
Step 2: Set the goals
It is up to you what color temperature and gamma you want. I suggest you first read "More technical part: Gamma, color temperature and colorimeters" first before beginning with this. The accurate settings are there too. It's up to you how you want to calibrate though. These are my tips you should keep in mind:
Red is the limiting color in our display. Try to keep it maximised and play with blue and green
The blacks can be harder to calibrate. Try to aim for an accurate gamma though. Color temperature is less of importance because you won't see blue or red blacks as good as you would see blue whites or blue blacks.
Always turn screen off and on after editing parameters. No changes will occurs if you don't!
As you will have to turn off your screen a lot, it might be easier to temporarily disable your lockscreen. This can save some time.
Step 3: The first parameter
1) Open the Shades of Grey folder with a Gallery App (I prefer QuickPic)and just open the first image (begins with “a RGB(255,255,255)....”). These images are sorted in the right order, you will only need to swipe.
2) Do a 'Free Measure' by pressing F7. I do usually three times for more accuracy:
Those three results I combine in one value with less decimals (usually 1). You will always get three different results, so you can't use just one of them. You will need to average them out. This creates uncertainty and therefore you remove two decimals. (If you get three times the same result, please keep it to one decimal. It's very unlikely you will get three times the same results another time)
3) Note these values in max luminance in the spreadsheet
4) Measure the second image (black) and note these values in min luminance. When you edit them, you will see the other values change.
5) It will probably the case that the first two values aren't resulting in your desired goals. Now you must correct this by editing the parameters. Open up Faux Gamma App (or any other app that can edit the parameters like FKU or Kcontrol)
6) Let's say I want to achieve 6500K. For that to happen, every color channel needs to result in the same value. Lred=Lgreen=Lblue.
In my previous result: Blue and green were higher than red. Red was maxed out, so I need to decrease blue and green
In Faux Gamma App (and Kcontrol) the first 12 parameters are reversed: Increasing parameters will decrease colors
In FKU this annoyance is removed: If you increase any parameter, the corresponding color will always increase
To decrease blue and green for the first value, I need to increase the first parameter in Faux Gamma App and decrease in FKU. Pay attention to which parameter you are editing. The 13th to 23th parameters are normal.
How much you should adjust is not determined. The only thing you know is that when you have a difference of 5 in luminance (Desired vs. irl), the adjustment in the parameters should be less than when the difference is 50.
7) In general this applies: The more accurate each parameter was calibrated in relation to the next parameter, the better the gamma.
The more accurate each color channel (Red, green and blue) was calibrated in relation to another, the better the color temperature.
Step 4: The rest of the parameters
1) When you are done calibrating the first parameter, continue to the next parameter. I usually start by calibrating all red, then green and finally blue.
2) In the Gallery, swipe to "c - p(2) - RGB(254,254,254)". This means parameter 2 (the c is for the right order in gallery apps). Measure this three times and take average.
3) Swipe to "ca - RGB(255,255,255)". Measure it three times and take average. This is max luminance again.
4) (Optional for parameters 1 – 14) Swipe to "cb - RGB(0,0,0)". Measure it three times and take average. This is min luminance again.
5) In the spreadsheet: Fill in max and min luminance. Then compare the first average of p(2) with the suggested value of parameter 2 in the spreadsheet.
6) Adjust accordingly in Faux Gamma App, Kcontrol or FKU. Screen off/on! And repeat substeps 2 to 5 until desired value = p(2) value.
7 - 99) Repeat for every other parameter.
PRO TIP: Save your work every 6 parameters! Just save it as a profile. When you reboot, you might lose your progress as the default profile is stock.
Temporarily get rid of your lockscreen. Unless you use Faux Kernel, you will need to turn your screen off and on a lot. Removing the lockscreen will ease that a bit and save you time!.
NOTE: If you want to save some time, you can skip measuring blacks (cb - RGB(0)..) every time. Just measure it fifty times with F8 mode while moving the colorimeter over the screen. Take average of those and keep it at those. You should get “Shades of Grey (No blacks).zip” then. It is better to measure black for 15 to 23 though!
Step 5: Review the results
1) Get Voodoo Screen Test Patterns App (free)
2) Open the app and set the amount of measurement points in the settings. [More=better, but more difficult]
3) Set the equal amount of measurement points in HCFR: (I use at least 25, b/c 24 parameters)
HCFR – Measures – Parameters – Number of Grayscale levels
4) Press “GO” and it will show images on your PC. You have to press next on your phone to keep up with the images.
NOTES: It’s a bit wonky and you should take multiple attempts at this for more accuracy
If calibration is done correctly, the color temperature should be around 6500K (+- 75K). The average gamma should be very close to your setting. The gamma line itself can be a bit squigglier, but keep it around the gamma you have chosen earlier.
Step 6: Share and contribute!
Please share you final product of hard work!
1) Save your profile using the Nexus Display Control app (FKU has this functionality too).
2) With a file explorer navigate to nexus_display_control/color_profiles and locate your profile.
3) Gather results from HCFR (right-click - save): gamma and color temperature (with saturation, luminance, near white, near black you are even better ;P)
4) Claim your glory and post the profile, HCFR images and you goals (which gamma and color temperature were you going for?) in this thread as a reply!
If you are really satisfied with the result, please consider buying me a beer I have done a lot of research to get to these results and they have all been done in spare time.
Testing without a colorimeter
Most of the users don’t have a colorimeter and you might not either. What can you test?
Banding: Less accurate, but still possible, you can check banding! By using gradient you can review the smoothness of the gradient. I have included gradients that are capable of doing this! You are looking for sudden interuptions in the gradient. If it is good, the gradient will appear smooth without any distortions.
Color Temperature: Though, incredible inaccurate and very biased, you can check color temperature subjectively. I do not recommend relying on it, but you can see the differences in hue and adjust the parameters. Though there is no way to measure it. I have included gray images that you can use!
You just swipe through the pictures and you will notice the different hues. Though it subjective to judge which one is incorrect…
Gamma: Short answer: No, not really.
Long answer (involves Display Tester App):
Although Display Tester App (and more apps alike) claim to test gamma, their results are biased . The principle the Display Tester App relies on is the following:
You create a background with a grid. The grid is composed of RGB (255,255,255) and RGB (0,0,0). This is the same as 0% and 100% gray. Because the eye can’t see individual pixels, the grid blends to a half tone: 50% gray. If you place a 50% gray block on the background, they should match. Up till this part, everything is correct.
There is one problem: The Display Tester App only tests 50% gray. 50% gray results in RGB (186,186,186). So basically, you are only testing only one RGB value out of 256.
To make this even more fun: The Display Tester App also messed up the background… While it should be a perfect grid of 0 and 255, it actually goes from 0 to 8 and 247 to 255. No, this is not better, it only is more biased. You can’t rely on RGB (1 to 254) as they are not calibrated yet.
If you have used the app, you may have noticed that changing the viewing angle, changes the outcome. The outcome is also dependent on ambient lighting, if the screen has been warmed up for 30 minutes, your eyes, brightness.
With so many variables you can’t believe this app will produce any reliable result… Even if it did, it would only count for RGB (186).
My advice: Do not rely on the Display Tester App or any other app that claims to be able to measure your gamma!
Notes:
- 50% gray = 0.5^(1/2.2) * 255 = 186 (It’s not 127/128 due to gamma correction)
- You can see for yourself that the app is biased: Change parameter 9 (any color) to 255. Open the app: no real difference right? The 2.2 box will remain the same and the background too, while if you look at photographs there is noticeable something wrong! This can’t be right, can it?
Saturation: Forget it.
Contrast: Very complicated process with another camera perhaps. Google is your friend. (It will be quite inaccurate: the camera alters the picture too (white balance))
Color checker cards
You could buy color checker cards and use those to calibrate. It's a bit cheaper.
Disadvantages:
Less accurate than a colorimeter due to inaccuracy of the eye and ambient lighting
Only one calibration possible: 6500K, gamma 2.2
If you are going to spend more than 40 on it, I suggest you buy a cheap colorimeter instead.
Should I use the RGB sliders?
Short answer: No, only for very specific purposes.
Long answer:
The RGB sliders shouldn’t be used if you want to improve your screen. If you want to make your screen all red, the sliders are perfect.
What the sliders to is limit the RGB range. If you set the red slider at 240, RGB(255) will become what normally was RGB(240). Every RGB value gets relocated from there between RGB(0) and RGB(240). You are basically limiting the amount of colors you can display. Not that awesome right? (Unless you want to do this)
Current state of development
Not everything has been uncovered yet:
Can be predicted how much one should increase a parameter to get a certain luminance?
My idea: Let’s assume that an increase of parameter Y with amount X always increases Luminance(Y) with the same amount. Let’s call the screen’s calibration when every parameter is set at 0, the base calibration. That base calibration is different for each display and define the characteristics. When measured correctly, one could calculate how much each parameter should be increased to get the desired luminance.
Explanation needed for the strange behavior of the first 8 parameters when all set to 0.
What is the mathematical connection of the white point in relation to the parameters?
The so called ‘white point’ is the only parameter that can adjust the entire RGB range. What is the mathematical connection between each individual parameter and the white point?
Changelog and credits:
Changelog:
26-5-14: Initial post placed
27-5-14: Fixed link, added color checker cards (Thx Tzfardaya), added white point measurements in post #2
1-6-14: Fixed type, thx @nihil0
16-6-14: Added profile: Yorici_Calibrated_Punch (see second post)
20-6-14: Added more info in FAQ under "How to get profiles?"
Immense thanks to:
@supercurio, @myfluxi, @faux123, @franciscofranco, @mag01, @rajendra82, @gpvecchi, @Tzfardaya, @granets, @tkoreaper, @ChazzMatt, @neriamarillo, @vomer, @The Gingerbread Man and everyone that helped with this!
If you still have any questions that weren’t explained (clearly enough), feel free to ask in this thread. I will keep adding questions which I think are useful!
NEW! Gamma Corrected Brightness (GCB)
Let's do a little experiment shall we? Set your screen's brightness at 0%, 50% and 100% consecutively. Notice something odd? That's right! The 50% doesn't seem like 50%. Why you ask? Well you are not a robot, but a fabulous human that perceives brightness different (i.e:non linear). Well how do you fix this?
We are introducing Gamma Corrected Brightness! This will solve that nasty issue we talked about. Best thing yet, this baby comes with multiple modes and works for every brightness level! And this will save you battery too! With GCB you will have a greater tendency to set a lower brightness than you normally would and that saves battery life!
Four modes are:
- Stock
- Gamma 2.0 (Stubborn) – A little bit more stubborn than the natural one for those who need that
- Gamma 2.2 (Natural)– The natural one that seems normal like it should be!
- Gamma 3.0 (Nightmode) – This one is for night times ^^
How to use:
1) Download and install Furnace Kernel
2) Open terminal
3) Enter for:
Stock: echo “0” > /sys/module/lm3630_bl/parameters/gamma_correction
Stubborn: echo “1” > /sys/module/lm3630_bl/parameters/gamma_correction
Natural: echo “2” > /sys/module/lm3630_bl/parameters/gamma_correction
Nighttime: echo “3” > /sys/module/lm3630_bl/parameters/gamma_correction
4) Done!
If you love Gamma Corrected Brightness, please consider to buy @savoca and @yorici a drink!
_________________________________________________________________________________________
Profile:
Yorici_Calibrated_Punch:
Goal: Maximum brightness possible with 2.35 gamma
Result:
Average gamma: 2.36
Contrast ratio: 1:1017
Color temperature: Around 8800K
Higher saturation due to higher gamma
Maximum brightness of 500 nits vs 440 nits on stock
So brighter, more saturated and higher color temperature: what is usually called punchy!
Advanced graphs:
The color temperature might appear to be really bad, but there is a reason for this:
On full black I get these luminances: R:0,4 G:0,4 B:1,2. The color temperature of this is > 12.000K. To preserve maximum brightness I had to keep these values. This difference of 0,8 slims down when luminance gets higher. And you can see that from 25% gray and on the color temperature remains more stable.
You will also notice that gamma gets a bit more wobbly at the end. That is because the measured values change more dramatically than at the beginning of the curve. I might try to decrease the wobblyness more in the future.
See attachments for profile!
Yorici_Calibrated_Accurate
Still in the works.. (Harder to make)
_____________________________
White point:
I have taken 16 measurements of the entire RGB curve and made gifs out of them:
Luminance:
RGB levels:
Color Temperature:
The slight bumps some times are due to mistakes, vibrations (got a text), etc. Ignore them.
What can we learn from this about the white point?
The white point seems to have the most effect on red (as seen in Luminance)
Extremer white point (towards 0 and 63) tend to increase the differences between the colors
That diversion gets bigger 50% - 100% gray with white point 31 - 63
That diversion gets bigger 0% - 50% gray with white point 0 - 31
White points 0 to 10 and 53 to 63 are more unstable and lead to unpredictable results.
A white point around 31 seems the best
Anything else?
Nice thread ...
great post buddy :good:
everyone: be sure to tag me if you make new profiles and want them added to my server
There is a way to do a very basic calibration without a colourimeter... but it requires a set of digital colour cards...
Basically a sheet printed with specific squares of colour you take a picture of said card, and then compare the colour displayed on screen with the colour of the card.... With a proper calibration, the two will match. (after correcting white balance)
Tzfardaya said:
There is a way to do a very basic calibration without a colourimeter... but it requires a set of digital colour cards...
Basically a sheet printed with specific squares of colour you take a picture of said card, and then compare the colour displayed on screen with the colour of the card.... With a proper calibration, the two will match. (after correcting white balance)
Click to expand...
Click to collapse
But again dependent on your eyes, ambient lighting, etc. ;/
Not ideal, but I can't disagree that it is indeed a method.
yorici said:
But again dependent on your eyes, ambient lighting, etc. ;/
Not ideal, but I can't disagree that it is indeed a method.
Click to expand...
Click to collapse
More reliant on your eyes than ambient lighting, since you should look at the picture under the same light. but yeah, it's a very rough way... Slow, tedious, and usually used more to check the calibration and white balance/colour correct photographs than actually calibrating the screen....
Tzfardaya said:
More reliant on your eyes than ambient lighting, since you should look at the picture under the same light. but yeah, it's a very rough way... Slow, tedious, and usually used more to check the calibration and white balance/colour correct photographs than actually calibrating the screen....
Click to expand...
Click to collapse
I assume you would buy a white tile that is 6500K? I could mention it in my thread though
yorici said:
I assume you would buy a white tile that is 6500K? I could mention it in my thread though
Click to expand...
Click to collapse
Heh, the white card is based on srgb, and is what a "properly calibrated and full srgb gamut" display should show at 255/255/255, same with the black card (0/0/0).
I also have an 18% grey card...
Makes white balancing a photograph extremely simple....
But can also be used (with great difficulty) to help calibrate a display (or check the displays calibration)
My man, I am subscribed! I'll update the required posts and threads by me when I'm feeling fresher (sober) in the AM
Edit
Nice to see this got stickied nice one!
Sent from my Nexus 5 using Tapatalk
nice thread, but the link to vomer's screen profile is broken because you add (" ") between the link
The Gingerbread Man said:
My man, I am subscribed! I'll update the required posts and threads by me when I'm feeling fresher (sober) in the AM
Edit
Nice to see this got stickied nice one!
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
I'm happy with the sticky as well
gravityy said:
nice thread, but the link to vomer's screen profile is broken because you add (" ") between the link
Click to expand...
Click to collapse
Good catch
Color temp is pretty good stock. For me its the gamma that drives me nuts. I've been waiting for your results to start with mine. As you noted Franco fixed his interface.
Thanks a ton. Spent my donation/app fund this week on Peek. You're up next.
Subscribed! Awesome work and lots of good info. Thanks @yorici
Are you able to share with us your profile @yorici? Will definitely be referencing this thread when I buy my own colorimeter in the coming month!
Sent from my Nexus 5 using Tapatalk
blackt5 said:
Color temp is pretty good stock. For me its the gamma that drives me nuts. I've been waiting for your results to start with mine. As you noted Franco fixed his interface.
Thanks a ton. Spent my donation/app fund this week on Peek. You're up next.
Click to expand...
Click to collapse
Haha great dude! Yeah it's more gamma that needs some attention, but color temp can be improved too. Also, if you have the money and you are willing to spend it, I would suggest buying a xRite i1 Display Pro. You would want this one for the speed. It very quick in measuring. (I got it recommended by Francois Simond. He has been calibrating the displays of the One Plus One) If you are completely crazy about colors, you should buy a spectrophotometer. But that is > €1000...
Bobtehblob said:
Are you able to share with us your profile @yorici? Will definitely be referencing this thread when I buy my own colorimeter in the coming month!
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
I must confess Everytime I start calibrating I discover something I don't know yet and I begin investigating it further Yesterday I took 16 measurements of the white point of which I will posts gifs of (So you can see the change). I just get intrigued and stop calibrating So I have some half baked profiles I need to continue.
In my opinion n5 display looks better than any other smartphone display I came across. It's just so easy on the eyes, I get a headache when I look other oversaturated panels. I'm not a gamma expect but I know how people faces are supposed to look so I pay a lot of attention to the skin tones when I look at the images on my phone, and any custom made profile can't be compared in the terms of color accuracy to the stock one. After all, can we calibrate the screen better than Google?
Bright Red Nexus 5
Updated post 2 with gifs about the white point! Please comment if you feel I missed something or concluded wrongly
defffizz said:
In my opinion n5 display looks better than any other smartphone display I came across. It's just so easy on the eyes, I get a headache when I look other oversaturated panels. I'm not a gamma expect but I know how people faces are supposed to look so I pay a lot of attention to the skin tones when I look at the images on my phone, and any custom made profile can't be compared in the terms of color accuracy to the stock one. After all, can we calibrate the screen better than Google?
Bright Red Nexus 5
Click to expand...
Click to collapse
The 'look at the faces' is indeed a good test to see if the display is a bit oversatured. Can we calibrate better? Yes, definitely.
The reason for this is that Google didn't do the calibration LG did. And LG had to build a profile that was an good average on all displays. No display can be exactly the same and especially when you have millions of units. The calibration is therefore not optimized on a per display basis and you can improve it
@yorici,
I have a eye one pro
What is this?
This is an insight for developers on how to calibrate the Sharp Display.
Lets's start:
This is how the Gamma arrays look like in our Panel Driver for each color:
Code:
[B]static char gamma_setting_r[] = {
[COLOR="RoyalBlue"]0xC7[/COLOR], [COLOR="DeepSkyBlue"]0x07[/COLOR], [COLOR="LightBlue"]0x08[/COLOR], [COLOR="Lime"]0x0B[/COLOR], [COLOR="Green"]0x12[/COLOR], [COLOR="Yellow"]0x22[/COLOR],[COLOR="DarkOrange"] 0x3D[/COLOR], [COLOR="Red"]0x30[/COLOR],
[COLOR="RoyalBlue"]0x42[/COLOR], [COLOR="DeepSkyBlue"]0x4F[/COLOR], [COLOR="LightBlue"]0x5D[/COLOR], [COLOR="Lime"]0x6C,[/COLOR] [COLOR="Green"]0x75[/COLOR], [COLOR="Yellow"]0x0F[/COLOR], [COLOR="DarkOrange"]0x14[/COLOR], [COLOR="Red"]0x18[/COLOR],
[COLOR="RoyalBlue"]0x12[/COLOR], [COLOR="DeepSkyBlue"]0x22[/COLOR], [COLOR="LightBlue"]0x3E[/COLOR], [COLOR="Lime"]0x30[/COLOR], [COLOR="Green"]0x47[/COLOR], [COLOR="Yellow"]0x7F[/COLOR],[COLOR="DarkOrange"] 0x4F[/COLOR], [COLOR="Red"]0x70,[/COLOR]
[COLOR="RoyalBlue"]0x78[/COLOR]
};[/B]
Dark Blue Column: Controls the panel's grey's - lower values are recommended here
Medium Blue Column: Controls the Panel's Mids - can't say much on that for now
Light Blue Column: Controls the contrast / brightness - this one is not clearly noticable what of the both it actually controls
Lime Column: Controls the saturation
Green Column: Controls the blacks - higher values are recommended / same like withepoint
Yellow Column: Controls the whitepoint - higher values have more detail but look grayish, lower values look stunning but have less detail
Orange Column: Controls the contrast / brightness - again, not sure which one of both, looks very similar to the Light Blue Column
Red Column: Controls the saturation - no noticable difference to the Lime Column
Each hexadecimal char has a range from 0 (0x00) to 255 (0xFF), though i am not recommending to drop/rise any parameter to the maximum/minimum.
The goal:
Blue-tint reduction, a gamma nearing 2.2 (actually it's ~ between 1.4 and 1.6 / i got no exact measurement stuff with me).
Calibration Example:
https://github.com/Tommy-Geenexus/android_kernel_sony_apq8064_yuga_4.4.4/commit/e73fb4ab07f972f9fcd54ef83304b28007d6d3fb
Although this is not perfect, it pushes the gamma in the right direction (~2.0 after applying this patch).
It may needs further whitepoint adjustion, but is a pretty good calibration base.
Thanks:
To @langeveld024 for the Datasheet.
Would be great if we could make the screen not suck down battery but I doubt it's possible? I wouldn't know.
Sent from Xperia Z via Tapatalk
CosmicDan said:
Would be great if we could make the screen not suck down battery but I doubt it's possible? I wouldn't know.
Sent from Xperia Z via Tapatalk
Click to expand...
Click to collapse
Eventually, i'll take a look.
Mmm, Zombie kernel already reduces minimum brightness so I was thinking there's nothing else really to be done. Maybe it's unrelated but compared to kitkat the screen battery usage in lollipop seems higher. I wonder if the "Screen" entry is an accurate thing to go by though, and also if it includes Gpu usage...
Sent from Xperia Z via Tapatalk
I switched from my LG V30 to a V40 about 3 day's ago.
I like the things they improved on the phone like the camera's and the reflectiveness of the screen / min brightness.
The thing that i dont like is the color reproduction i just cant get it right. Web gives the best colors but they are washed out compared to the V30 on Cinema. Moving to Cinema colors are blown out of proportion.
Manual settings have the same issue. Saturation neutral is still to much. One step lower is slightly washed out.
When i think i got red on the right value for pictures compared to the V30 a white screen looks red. If i fix that pictures look to green.
What settings do you guy's use?
Left it on 'Auto'. Never one to over-obsess with minor issues. The display is good enough to do colors on its own.
Sent from my LM-V405 using Tapatalk
Tried different ones Auto has been the best. It's a bit oversaturated but white point is good.
I see Auto setting still gives control over color temperature and RGB colors. You left those default? (neurtal and RGB maxed out?)
The cinema setting looks a bit more natural compared to Auto. (less overstaturation) And if i compare my picture to the real thing in real life the Cinema setting comes closer.
I believe I found better setting for myself to fix oversaturated display.
Expert mode, default color temperature, saturation and sharpness all the way down?
Found some extra information:
https://www.xda-developers.com/lg-v40-thinq-display-review/
Seems LG screwed up the Expert mode an almost all other color profiles. Googles does a better job using the same display.
Most accurate is the Web profile. Expert is not usable because color tempertature is above 7100K in all settings.
After web comes the Photo profile and after that Cinema. But that feels to overstaturated to me. While web lacks a bit of punsh. I guess that the UI was not made for the web mode and it looks understaturated because of that when using the web mode.
But for now i guess i will keep using web mode. I want to be able to see if the pictures that i take have the correct white balance and thats not possible in cinema mode. Faces look way to red. Same goes for photo but its less extreme.
Lets hope LG does a better job with the new android version later this year....
Out of the box the LG V40 ThinQ targets a cool and punchy color profile that is about 25% more saturated than our standard RGB color space. In the Auto and Expert profiles, it is possible to modify the display’s overall color temperature (albeit in a flawed manner) and to modify the relative reds, greens, and/or blues. The handset offers 6 other color profiles, and do provide profiles that accommodate the P3, Adobe RGB, and the sRGB color spaces. However, all three of the reference color profiles have a greenish-white point, and only the Web profile (which targets the sRGB color space) competently matches its target (though as seen in our Pixel 3 display analysis, LGD’s panels are completely capable of having near-perfect color accuracy with more adept calibration). Furthermore, none of the color profiles support Android’s color management, introduced in Android 8.0 Oreo, and even if it did, it wouldn’t mean much since almost no Android apps support it.
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Starting at the profile with the most important color space to target, the Web profile does an alright job at reproducing the sRGB color space. However, as shown on the color accuracy plots above, the white point has a noticeable color error shifting towards green, which is also observable on the plot chart in the yellow, cyan, and cyan-blue color mixtures. Pure reds are also slightly oversaturated, but not too-noticeably so. Overall, the profile has an average color error ΔE of 1.7 and a maximum color error ΔE of 3.1 at 100% cyan-blue and 25% yellow, which is mostly accurate and acceptable for hobbyist-level sRGB color work in photos and video.
The Cinema profile, however, is not as accurate and contains a lot more colors with higher color differences. Almost all colors, besides the gamut primaries (100% red/blue/green), are oversaturated, and there’s noticeable error all throughout the reds, red-yellows, yellows, and greens. The white point shared with the Web profile is also too green. The profile has an average color difference that is considered just-noticeable (ΔE = 2.3), with a maximum error ΔE of 4.2 all around the red-yellow-green region. I would like to reiterate that this profile is meant for content that targets the P3 color space, and everyday use of it will result in content colors that will appear oversaturated.
The Photo profile is also not too good, beginning with the display’s green emitter not capable of reaching the full chromaticity of the Adobe RGB green primary; however, the 100% green color difference is not noticeable. Below 100% green saturation, however, there is noticeable color error with a high color error ΔE of 5.0 at 25% green. Yellows also show a lot of noticeable errors, a few other just-noticeable color differences are scattered throughout the gamut. The profile has an overall average color error ΔE of 2.1 (which is technically mostly accurate), but the high color errors the profile contains makes it unsuitable for color-critical work in the Adobe RGB color space.
Click to expand...
Click to collapse
So I bought my S21 Ultra last Friday. I lie with my mobile in bed late at night with brightness at its lowest with "dark mode". Notice that when I have dark gray backgrounds and open the keyboard, horizontal lines appear (thin light lines). They disappear as soon as I close the keyboard.
Someone who can test if you see the same thing?
So If I sent it back to samsung I can say that i have asked owners and they dont have that problem.
1 set brightness at minimum
2 darkmode on
3 120hz on
4 high contrast on keyboard
5 total black rooms
6 open play store and press search so keyboard appears
7 now I see thin lines (which disappears completely when I close the keyboard)
It looks like this
If it is application dependent (appears only when the keyboard is active), it might be a software alrifact.
Also, please bear in mind that OLED displays, when set to minimum brightness, might have a problem with displaying uniform colors. You might see clusters of tens of pixels that are just a tad bit brighter than the ones around. I've noticed this with every OLED display I have used in the last decade or so.
daniel_loft said:
If it is application dependent (appears only when the keyboard is active), it might be a software alrifact.
Also, please bear in mind that OLED displays, when set to minimum brightness, might have a problem with displaying uniform colors. You might see clusters of tens of pixels that are just a tad bit brighter than the ones around. I've noticed this with every OLED display I have used in the last decade or so.
Click to expand...
Click to collapse
Ok thank you.
Yes it's only showing when i use the keyboard.
My old note 10 plus did not have this problem.
Different screen, different version of Android and Oneui, maybe even different keyboard, keyboard version or theme.
check app named Display Tester https://play.google.com/store/apps/details?id=com.gombosdev.displaytester&hl=en
robalm said:
So I bought my S21 Ultra last Friday. I lie with my mobile in bed late at night with brightness at its lowest with "dark mode". Notice that when I have dark gray backgrounds and open the keyboard, horizontal lines appear (thin light lines). They disappear as soon as I close the keyboard.
Someone who can test if you see the same thing?
So If I sent it back to samsung I can say that i have asked owners and they dont have that problem.
1 set brightness at minimum
2 darkmode on
3 120hz on
4 high contrast on keyboard
5 total black rooms
6 open play store and press search so keyboard appears
7 now I see thin lines (which disappears completely when I close the keyboard)
It looks like this
Click to expand...
Click to collapse
robalm said:
So I bought my S21 Ultra last Friday. I lie with my mobile in bed late at night with brightness at its lowest with "dark mode". Notice that when I have dark gray backgrounds and open the keyboard, horizontal lines appear (thin light lines). They disappear as soon as I close the keyboard.
Someone who can test if you see the same thing?
So If I sent it back to samsung I can say that i have asked owners and they dont have that problem.
1 set brightness at minimum
2 darkmode on
3 120hz on
4 high contrast on keyboard
5 total black rooms
6 open play store and press search so keyboard appears
7 now I see thin lines (which disappears completely when I close the keyboard)
It looks like this
Click to expand...
Click to collapse
What model, carrier and software build do you have?
Software build: (settings > about phone > software information - last 4 digits of SW build number)
Is this happening in all the apps? or just the email as shown in the picture?
try it on safe mode and see if it still happens. maybe you are using a third party keyboard?
AM3000 said:
What model, carrier and software build do you have?
Software build: (settings > about phone > software information - last 4 digits of SW build number)
Is this happening in all the apps? or just the email as shown in the picture?
try it on safe mode and see if it still happens. maybe you are using a third party keyboard?
Click to expand...
Click to collapse
SM-G998B
G998BXXU3AUHB (same problem with older firmware)
It happend in dark grey and some light color, swifty keyboard and stock samsung keyboard, showing must if i use high contrast in stock samsung keyboard.
Here is one more:
Display issue at 120hz and low brightness
My note 20 ultra has vague gray horizontal lines when displaying a gray background at the lowest brightness when running at 120Hz but it disappears at when the brightness increases or when switching to 60hz. Is this normal for AMOLED displays ?
forum.xda-developers.com
Strange no one can test it so when i send it to samsung and maybe get a new phone and the same thing will show on that one to..