[Nexus 4 Q&A, Help & Troubleshooting] Kel Ghu:
***NOTICE***

PLEASE READ THE OP ATTENTIVELY BEFORE POSTING (IT GETS UPDATED DAILY)

This thread is about sorting the different type of screen.

All we ask is you test the settings provided in the OP and return your results for gamma test (4th test image).

We do not want any new settings unless you provide us gamma results showing your screen significantly don't belong to any of the screen type listed in the OP.

This thread is not about subjective preference and taste, overall aesthetic or accuracy (because it has no meaning if people have different screens), but only about one objective thing, gamma test

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Current Method Screen count: Type K - 1 / Type H - 2

Old Method Screen count: Type K - 5 / Type O - 14 / Type V - 1 / Type C - 5

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Hello everyone,

Ill build the op with our discussions.

Please tell us which kind screen you have, revision of your hardware (find out here) and lcd_make_id Find it here.

PROTOCOL

1) Install Franco's Kernel.Update app and the latest kernel

2) Test the screen using the 4th test (4th image, just touch the image to switch) in the gamma control panel.

3)

You should see no color band holding your phone afar with your hand (1 arm length) but only a greyscale gradient from black to white.

4) Return your results so we can sort the data.

Type H (formely known as Type O) - halluci293's settings

RGB 200,190,185*

Gray 0

Mids 23

Blacks 119

Contrast 0

Brightness 8

Saturation 23

Whites 0

Type K - Kel Ghu's settings

RGB 185

Greys 0

Mids 6

Blacks 119

Contrast 19

Brightness 15

Saturation 7

Whites 0

OBSOLETE but you can still test with this method, results are always welcome.

TESTING SCREEN USING DISPLAY TESTER

If none of there settings gives you a gamma of 2.2, please TELL US! And give us a setting that is adequate for your screen:

Our screen type is the one which gives 2.2 gamma for red, green and blue (NOT GREY) in "Display Tester" app. Kernel is r83 onward using Franco app v.8.8:

Application to use to measure gamma:

Display Tester

PROTOCOL 1

1) Install Display Tester, latest Franco's kernel and application (Franco's Kernel Updater).

2) Test each of the settings provided below.

3) Post your gamma for RED, GREEN and BLUE for each of the settings.

4) Optional but still important: Provided us Production date, HW revision, kernel version and lcd_maker_id

Screen gamma: Type K > Type O > Type V

Type K - Kel Ghu's settings (gamma 2.2 confirmed) - 212K rev.11

Corrected values, r83 and onward

RGB 255

Grays 0

Mids 0

Blacks 71

Contrast 3

Brightness 0

Saturation 71

Whites 0

Uncorrected values, r83 and onward

Greys 0

Mids 0

Blacks 255

Contrast 255

Brightness 0

Saturation 214

Whites 60

Type O - Obsanity's settings (gamma 2.2 confirmed) - Recommanded settings in Franco's app

Corrected values, r83 and onward

RGB 255

Grays 0

Mids 119

Blacks 119

Contrast 23

Brightness 0

Saturation 119

Whites 103

Type V - VisceralPsyche's settings (gamma 2.2 confirmed)

Corrected values, r83 and onward

R 181

G 167

B 162

Grays 0

Mids 5

Blacks 119

Contrast 1

Brightness 0

Saturation 7

Whites 2

Type C - ceejay83's settings (gamma 2.2 confirmed) rev10

Corrected values, r83 and onward

Rgb 255

Grays 0

Mid 103

Blacks 119

Contrast 0

Brightness 6

Saturation 71

Whites 3

Corrected values

It's the steps values defined in Franco's app v8.8. (Source needed)

Uncorrected values

All values

Response format

: Gamma results + HW revision + kernel version + lcd_maker_id

DO NOT give us new settings unless none of the provided ones work

FAQ

How do calibration test work in Kernel.Update?

Misconception about Brightness, it should not change Gamma.

It's true, brightness should not influence gamma. But it's simplistic just to say that, because that's for an image or a perfect screen. Even prosumer monitor are not perfect, the only way to have it almost perfect is to have software to help compensate (custom color profile). The problem is the LCD backlight that changes the saturation, so perceived luminance and gamma changes over the different brightness levels. And no, calibration shouldn't always be done at 100% brightness because most LCD screens have saturation problem at extreme brightness. At the end, calibration brightness should be done where saturation is optimal or, in our case, where the median value is because our screen changes brightness all the time, not like a desktop LCD monitor.

Why 2.2 for gamma? (Obsolete)

Why 2.2 for RGB only? (Obsolete)

Because our screen is a Red, Green and Blue (RGB) screen. Those 3 additive colors creates all the others displayed. So it has meaning to calibrate them to 2.2 more than greys and let alone Cyan, Magenta and Yellow which are RGB added 2 by 2. But one calibrate grey instead of RGB.

UNDER CONSTRUCTION - please help us!