yashsingh1/xdaforums huggingface dataset:
[Nexus 4 Q&A, Help & Troubleshooting] tazer808:
Aloha guys,

Just thought i'd share what i've come up with to get a "greyscale gradient from black to white" on the 4th test image.

YMMV but i wanted to share what i think meets with the process requested in the OP. Not many 301K, h/w 11 posts, so i thought i'd contribute.

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.

My specifics:

- Production Date and Place Identification: 301K

- Hardware Revision: 11

Test scenario:

- franco.Kernel r102 + App v8.9.1

- Paranoid Android 3.1 (Mar 11)

- Brightness: 50%

- 4th Test image greyscale gradient, minimal to no color banding as the goal.

- Viewed at arms length (approx 2ft away)

Screen Color Tuning:

Red - 171

Green - 157

Blue - 173

(Alternative (brighter)) Screen Color Tuning (worth giving a shot, still kinda dark on auto-brightness imo):

Red - 205

Green - 175

Blue - 205

Screen Gamma Settings:

Red - 0, 7, 119, 0

Green - 0, 7, 119, 0

Blue - 0, 7, 119, 0

Misc. Gamma Settings

Contrast - 5

Brightness - 8 (or 7)

Saturation - 23

I hope this helps in some way. IMO at a static 50% brightness the colors are very nice. pictures are sharp and not over saturated (not bleeding into other colors). There is still a little bit of color (very light) banding but it's very close to 'greys' (imo)

Using Display Tester (@50% brightness):

Grey - 2.4-2.6

Red - 2.2

Green - 2.0

Blue - 2.0

Yellow - 2.4

Cyan - 2.4

Magenta - 1.8

Set to Auto-Brightness though... while indoors in my office, sadly i think it's perhaps a bit too dark. I'm gonna see how i adjust to it over the next few days, but if i can find a way to make it tolerable while indoors I'll update this post.

In any case, i hope the above helps someone find at least a 'starting' point for doing their color tuning.

Aloha!
[Nexus 4 Q&A, Help & Troubleshooting] enursed:
your settings look good on my screen (hw_11, 212K).

Maybe a bit dark.

you could try my settings:

RGB: 185, 185, 185

GAMMA:

RED: 119, 6, 119, 0

GREEN: 119, 6, 119, 0

BLUE: 119, 6, 119, 0

Contrast: 23

Brightness: 19

Saturation: 39

greetz
[Nexus 4 Q&A, Help & Troubleshooting] fozzie:
Seriously? Sorry man but that looks horrendous. There's something seriously wrong somewhere if you need to back off green by that much. Everything is red/pink :(
[Nexus 4 Q&A, Help & Troubleshooting] tazer808:
Would it be too much trouble to say what manufacture date/place and h/w revision you tried my settings on?

i do not have the problem you're saying you see. so i don't think you read my post and what my specific hardware is.

As i stated earlier, this is what i've found (so far) to make the "4th test screen" in franco's app to appear gradient grayscale black to white with minimal to no color banding on my particular hardware. It does not appear reddish or pinkish, and as i stated in my post, if anything it's a bit darker than i'd like it on auto brightness.

Thanks for your input but more constructive criticism with more specifics on the platform you tried the settings on would be much more welcome.

Aloha

---------- Post added at 07:36 AM ---------- Previous post was at 07:13 AM ----------

Thanks for the input and i just tried your settings. I get a little bit of color banding on the 4th test screen @ 50% brightness, but it's not a deal breaker, your settings produce the following for me in Display Tester (not that they mean anything anymore, just that i use them to judge the differences)

Gray: 2.6

Red: 1.8

Green: 2.0

Blue: 2.0

Yellow: 2.4

Cyan: 2.4

Magenta: 1.8

Overall your settings are pretty similar to mine, other than i notice a little bit more color banding on the 4th test screen. Might be the difference in manufacture date... ?
[Nexus 4 Q&A, Help & Troubleshooting] rxmxsh:
Wow. Spot on. I'm rev 11, 301k
[Nexus 4 Q&A, Help & Troubleshooting] gharrrrrr:
Settings posted by enursed are perfect on my screen. The auto brightness always seems to be to dark no matter what gamma settings I use. But set screen to about 50% and it looks great with those gamma settings. Not sure what screen or revision I'm on.

Edit: decided not to be lazy and look up screen info. Lcd-id is primary and rev11 01/2013.
[Nexus 4 Q&A, Help & Troubleshooting] kin24173493:
Do you have any recommended settings for 212k rev 10?
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
Hey that is actually my exact specs too. Check a few posts back and use the latest color settings I posted. I'll be posting new updated ones specifically for us very soon.

Tell me how you like the old ones though. Another guy had the same specs too earlier in the thread and said they were awesome, but decided he'd rather have a more saturated, contrasty display. Though I have my own calibrated settings that are perfect for that. And they are posted in this thread too.
[Nexus 4 Q&A, Help & Troubleshooting] rxmxsh:
This is perfect, but I'm going with Type V for now. Not as perfect, but better blacks.
[Nexus 4 Q&A, Help & Troubleshooting] kin24173493:
isn't it the latest settings? i've been using it quite a period. accurate color without banding. but one thing is that the screen is pretty hard to read while outdoor even though i set the brightness to 100%. so can we bump up the RGB a bit higher for getting a brighter screen? cheers;)
[Nexus 4 Q&A, Help & Troubleshooting] gharrrrrr:
Really like enursed settings. But wanted a bit more pop out of colors. Trying a new setting on rev 11 screen that has been looking good so far. Test 4 looks good. Little bit of green noticeable.

Rgb: 200

Grey: 119

mid: 6

Black: 119

White: 0

Contrast 10

Brightness: 15

Saturation: 55.

Still playing around with it though so would enjoy feedback from other N4 owners with same screen. Cheers. :thumbup:
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
Trust me, I'm definitely working on that. So far, so good. Should have the new settings up by tomorrow
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
Also, FYI you can bump the RGB to 215 each. That will definitely help out
[Nexus 4 Q&A, Help & Troubleshooting] steviewevie:
Guys, if you've been following this thread from the beginning then you'll have seen that there hasn't been any evidence so far to suggest that hardware rev is relevant to what sort of screen you have - e.g. plenty of people with both rev 10 and 11 using the same settings to get perfect gamma.

Sent from my Nexus 4
[Nexus 4 Q&A, Help & Troubleshooting] kin24173493:
Just tried faux kernel with faux display. There are a lot more settings than franco kernel app.
[Nexus 4 Q&A, Help & Troubleshooting] fozzie:
I just wanted to give a shout out for bundi22's settings at http://xdaforums.com/showpost.php?p=38968627&postcount=18705

(I'm currently using the second set of settings but I do like both!)

I only recently noticed the 'Real World photos' that are in the Display Tester app that some people are using. There's one in particular called 'Dark colors' that's quite revealing about how your black levels are set. When I first looked at the image with my previous settings (I forget which ones, but one of the more popular sets), the picture just looked like a lake with the moon's reflection on it. I then changed to bundi22's settings and boom, there's a actually a whole load more detail in the picture.
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
Okay I did it. I'm going to sleep now. +/- 1 for all the settings. Tell me what you think. I have plenty more I'm working on, these just happened to fall together first. For me, image 2 is perfect. I haven't tested these settings as a daily driver, but I'm fairly confident they're much brighter than the previous settings. Let it be known that I did calibrate these color settings with my display brightness set at 50%.

Red: 190

Green: 180

Blue: 185

Sub-Red

Grays: 23

Mids: 4

Blacks: 103

Whites: 1

Sub-Green

Grays: 23

Mids: 3

Blacks: 103

Whites: 1

Sub-Blue

Grays: 23

Mids: 5

Blacks: 103

Whites: 1

Misc. Gamma Settings

Contrast: 25

Brightness: 20

Saturation: 39

My suggestion is if you want to tweak these settings at all, start with the miscellaneous section. That was the most flexible of all the settings. And oddly enough, green was especially hard to calibrate, bit I figured it out :)
[Nexus 4 Q&A, Help & Troubleshooting] dagaetch:
Great settings, perfect on my (210k, rev10) screen for gamma. I bumped the brightness up a bit from 50%, just because I like a brighter screen.
[Nexus 4 Q&A, Help & Troubleshooting] ckarv:
Same here, it's just a tad too dark for use with auto brightness. Is there a compromise that would allow for higher RGB?

These are my settings at the moment, comments are welcome:

RGB: 255

Sub: greys, mids, blacks, whites

Red: 0, 0, 87, 2

Green: 0, 0, 87, 2

Blue: 0, 0, 87, 2

Misc: 15, 15, 71

PS. I seem to have the same screen as whosdaman and you, dagatech. So especially your input is appreciated.
[Nexus 4 Q&A, Help & Troubleshooting] milesmarrero:
So what are we trying to calibrate to, display tester or the test images? Calibrating to image 4, or any images in the app, always makes my screen look washed out and stock colorish. Calibrating to 2.2 in display tester gives me good colors and everything.
[Nexus 4 Q&A, Help & Troubleshooting] rxmxsh:
Same thing here. I ended up using these: http://xdaforums.com/showpost.php?p=39012344&postcount=18949
[Nexus 4 Q&A, Help & Troubleshooting] ceejay83:
I like these more vibrant, brighter colors. I'm just going to ditch trying to make the gamma settings correct and go by what I think looks good
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
Lol, would you believe me if I said I have those exact settings already saved for a future project? My RGB is set to 215, but that's because it's my base. I was going to experiment with a lower black value to see if it could help me push up the brightness while still passing my requirements. So basically, you already know I approve :thumbup:.

Maybe I'll just start working with them now. I have a new set nearly finished. I'm working on finding some way to raise the RGB values while also keeping the top row of image 2 calibrated. If the RGB values are set too high, they will overblown.

Now, to everyone attempting to calibrate your screen to industry standards using display tester (DT), ask yourself these questions. What about the blacks and whites? What about the other color tones? Are the colors even balanced? Or, for the image 4 peeps, how do you know what the loud colors even look like? Lol, I'm sorry, let me explain...

DT's gamma checker is a basically a magnified version of the second calibration image found in the FKU. It is complex to understand, so I'll use an example to help. Ever notice how changing the brightness will affect your gamma values? Well, that's not suppose to happen. This could be happen for numerous different reasons. I think it happens because DT doesn't account for color tones at all. It could be that DT uses the devices' brightness value to render the tone of the hue (Very unlikely). If either of these are true then it means that it isn't possible to calibrate our displays using only DT as a reference.

Moreover, the white screen has a terrible green tint to it, and there is no black comparison. So, how exactly do we ensure properly calibrated white and black values?

When image 4 is perfectly calibrated, it only reveals gradients for neutral colors. We need to make sure all the colors are good too. But hey, at least it'll prevent color bleeding and banding. :P

And that's why I started using the images in FKU. They're the same ones that professional calibrators use on monitors and televisions. I mean, don't get me wrong, it could be better. I could have the tools they use lol.
[Nexus 4 Q&A, Help & Troubleshooting] dagaetch:
I like these settings on my screen. Nice and colorful while not too contrasty.

As much as it's fun to try and match the gamma settings, in the end I'm using my phone for emails and web browsing, so it doesn't really matter. Colors that I like are whats important!
[Nexus 4 Q&A, Help & Troubleshooting] nbeebe24:
I played around with the settings today and got something I like. I was leaning more toward natural looking colors after running some overly saturated settings for a while. Here's what I have:

Screen Color Tuning:

RGB - 255, 255, 255

Screen Gamma Settings (same for Red, Green, and Blue)

Grays - 2

Mids - 71

Blacks - 119

Whites - 1

Misc. Gamma Settings

Contrast - 1

Brightness - 4

Saturation - 71

Please tell me what you guys think.
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
Okay, I have screwed around with the settings long enough. I had two settings perfect settings ready, and about to post when I UV'ed my phone a little too much and caused the back-up files to become corrupted. I was so pissed I actually took a day off. Seriously, it was the first time I've ever had a RGB above 240 and pass image 4. The only one that was noticeably off was image 2. I am only able to get 2 rows at a time, never all three. It was extremely close though. I treated every setting individually too, so basically each setting was a different value depending on what was necessary. It took a long time.

The second setting was perfect. Literally, it was the best one I've ever seen. The RGB was at 225, which wasn't too bad, unfortunately both of those are gone. I tried replicating them, but I could never do it. I got some that are similar, and close to what I had discovered. I'll only be working on the outdoor setting one from now on. I know a perfect calibration exist for it. I just have to find it again. :(

Anyway, he is the new outdoor one I came up with. Image 2 and 4 and off, but not by much. It is closer than any other to being calibrated at a high RGB setting. These are a standardized set, meaning that RGB were treated equally. I haven't worked on it anymore just because it is exhausting and hard on the eyes. We'll see what you guys will be able to do with these.

Optimized for Outdoor Viewing

RGB: 240

Sub: greys, mids, blacks, whites

Red: 0, 3, 103, 2

Green: 0, 3, 103, 2

Blue: 0, 3, 103, 2

Misc: 31, 28, 71

--------------------------------

I'll be waiting for comments. Start with the "Misc" section first when tweaking these. Adjusting the individual RGB settings are a pain in the ass. I think after I finish this last set, I will start working with faux. Though, I'm pretty happy with these. Used them today when I was walking around campus. They were much better than the rest for visibility. Considering I held it at 240 for RGB it better be lol

EDIT: I already have better setting than the ones I posted above.

Revisions coming soon. These barely have any color banding in image 4, and I upped the RGB to 245 ;)
[Nexus 4 Q&A, Help & Troubleshooting] kin24173493:
looking forward to see your final perfect settings with franco. thx for your hard work:victory:
[Nexus 4 Q&A, Help & Troubleshooting] dagaetch:
So I was playing around with whosdaman's settings, and came up with the following. It's pretty much the same gamma results, but seems to have a little more color punch which I like. Just sharing...and major props to the people who actually spend the time to give us non-professionals a starting point!

RGB: 245

Red/Green/Blue: 0, 3, 87, 2

Misc: 15, 15, 87
[Nexus 4 Q&A, Help & Troubleshooting] fozzie:
I'm liking these. Thanks.
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
Well I traded my rev10 for a rev11 nexus 4. I could definitely see a difference in stock displays. Rev11 is slightly more saturated in colors. The colors don't appear to be as washed out as the rev10.
[Nexus 4 Q&A, Help & Troubleshooting] steviewevie:
That is almost certainly just a natural variation between different LCD panels. Rev 11 was a motherboard change, not a screen revision.

Sent from my Nexus 4
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
O yeah? Do we have a source for that?
[Nexus 4 Q&A, Help & Troubleshooting] SchmilK:
On rev10 did you get a lot of purple haze in photos? I do even in low light conditions. Curious if RMA will yield better photos
[Nexus 4 Q&A, Help & Troubleshooting] steviewevie:
There have been posts/threads showing pages from LG's internal documents detailing the (very minor) motherboard changes. If you search you should be able to find them.

Also, threads about screen calibration have had some people with both rev 10 and 11 phones using the same gamma settings and getting the same results via display tests.

Sent from my Nexus 4
[Nexus 4 Q&A, Help & Troubleshooting] ceejay83:
Yea the rev has no bearing on what your screen looks like. I've had two rev 10's and one had a cool screen and the other one was warm.
[Nexus 4 Q&A, Help & Troubleshooting] Whosdaman:
Fair enough.
[Nexus 4 Q&A, Help & Troubleshooting] sirxdroid:
I have a 302K (made Feb 2013 Korea), rev 11. I tried the tests in the first post and with either of the 2 settings I get slight colors in the gray bands, so I'm not sure what display type I have, neither settings look like a pure black-white gradient. What should the device brightness be set to in the Settings not in the app - the OP doesn't specify it. Auto? Max? Middle?

Using Franco kernel r119 with f.Ku 9.0 app.

However, there seems to be a bug in the app, if you save any of the profiles any 0 values in the sliders get saved as 114 which Franco says it's not a valid value. There may be other values that are not correct too. I wonder whether the values are actually played back to the kernel correctly or they are all buggered up hence I can't get the gray bands to not have colors in them. Franco says there's going to be an update to app this weekend, hopefully it corrects these errors. I'll test again in a few days.
[Nexus 4 Q&A, Help & Troubleshooting] steviewevie:
Have you tried the following? Move each slider to the maximum and then back to zero, then to the values you want. Does it still save the zero values as 114?

Sent from my Nexus 4
[Nexus 4 Q&A, Help & Troubleshooting] sirxdroid:
Even so, how do we know what the app really sends to the kernel if there's a bug in the app? I guess the reliable way to do this would be to write to the sysfs files via a script. I'll try that later today and not use the app at all.
[Nexus 4 Q&A, Help & Troubleshooting] steviewevie:
I don't think the bug in the app is as bad as you seem to think it is. Did you try my suggestion?

Sent from my Nexus 4
[Nexus 4 Q&A, Help & Troubleshooting] sirxdroid:
Just tried it. Thanks for the tip, it does saves 0s now if you play with the sliders a bit. Someone posted a rar with 24 profiles in the Franco thread, many if not all of the profiles have 114 in them. Franco just announced a new app push with some built-in profiles. It would be great if the 2 profiles in the OP could be included so we know they are correct and people can easily test, rather than inputting manual values which could also be error prone. Or the OP could just attach the 2 saved profiles.
[Nexus 4 Q&A, Help & Troubleshooting] sirxdroid:
New version of f.Ku app is out that fixes the wrong values in saved profiles.

@Kel Ghu - I think if you saved the 2 profiles and attached them to the original post more people might chime in with their findings, you know those who shy away from entering 15 values correctly :)

As for my phone, I can't get the gray gradients to not have colors in them with either of the 2 settings, not sure what's going on. Maybe my eyes see colors when there aren't any :) Or maybe I have some other type of display that hasn't been covered yet.
[Nexus 4 Q&A, Help & Troubleshooting] dagaetch:
so remember how I said I don't know what I'm doing? Yeah...I thought we were looking at the grey one mainly :o

looking at the individual RGB gammas, your settings give me basically perfect 2.2 across the board. the obsanity defaults are very close, but more like 2.1. I'm using r82, don't know my hardware revision will check tonight.
[Nexus 4 Q&A, Help & Troubleshooting] EnIXmA:
Re: Screen Type: Finding it with Franco's kernel

Rev 10 r83 and the recommended settings in the app gives me 2.2 for blue, green and red
[Nexus 4 Q&A, Help & Troubleshooting] yokuyuki:
211K + Rev 10 + r83

Stock

Gray: 1.8-2.0

Red: 1.6

Green: 1.6-1.8

Blue: 1.6

Yellow: 1.8

Cyan: 1.8-2.0

Magenta: 1.6-1.8

Type K corrected

Gray: 3.0

Red: 2.6

Green: 2.6

Blue: 3.0

Yellow: 2.8-3.0

Cyan: 2.8

Magenta: 2.4-2.6

Type O uncorrected

Gray: 2.2-2.3

Red: 1.8

Green: 1.8-2.0

Blue: 1.8-2.0

Yellow: 2.1

Cyan: 2.2

Magenta: 2.0

Type O corrected

Gray: 2.8

Red: 2.2-2.3

Green: 2.2-2.3

Blue: 2.3

Yellow: 2.4-2.6

Cyan: 2.4-2.6

Magenta: 2.2

Type V corrected

Gray: 2.2-2.3

Red: 1.8

Green: 1.8-2.0

Blue: 1.8-2.0

Yellow: 2.1

Cyan: 2.2

Magenta: 2.0

Type C corrected

Gray: 2.4-2.6

Red: 2.1

Green: 2.1

Blue: 2.2

Yellow: 2.4

Cyan: 2.4

Magenta: 2.1
[Nexus 4 Q&A, Help & Troubleshooting] :
AW: Screen Type: Finding it with Franco's kernel

Rev_11 with r83

Stock:

Between 1,2 and 1,4 for all colors

Obsanity:

Grey: 2,4-2,6

Red: 2,0 -2,1

Green: 2,1

Blue: 2,1

Yellow: 2,4

Cyan: 2,4

Magenta: 2,1

Kel:

Grey: 2,6-2,8

Red: 2,2-2,3

Green: 2,4

Blue: 2,3

Yellow:2,6

Cyan: 2,6

Magenta: 2,3

All done on 50% brightness.
[Nexus 4 Q&A, Help & Troubleshooting] Kel Ghu:
Re: Screen Type: Finding it with Franco's kernel

And none gave you 2.2 amongst those I provided?
[Nexus 4 Q&A, Help & Troubleshooting] ceejay83:
Re: Screen Type: Finding it with Franco's kernel

Nope, I get 2.6 across the board
[Nexus 4 Q&A, Help & Troubleshooting] Kel Ghu:
Re: Screen Type: Finding it with Franco's kernel

This looks like a 4th screen. I'll put your setting if you calibrate it to 2.2 for RGB.
[Nexus 4 Q&A, Help & Troubleshooting] Evil_munki:
Perfect gives me 2.2 RGB too.:good:

I can confirm this too.
[Nexus 4 Q&A, Help & Troubleshooting] ceejay83:
Re: Screen Type: Finding it with Franco's kernel

We're nexus soul mates :)
[Nexus 4 Q&A, Help & Troubleshooting] MMeester:
AW: Screen Type: Finding it with Franco's kernel

Same hardware, have been testing profiles that other people posted all day.

Obsanity is the closest I come to 2.2 on my screen.

My readings are a bit different though.

Red 2.1-2.2

Blue 2.2

Yellow 2.3-2.4

Cyan 2.3

The other values are the same. I'll probably test other profiles tomorrow.
[Nexus 4 Q&A, Help & Troubleshooting] mrxd:
I don't have the box with me here, but my phone is a rev 10.

Type K corrected is definitely the closest for me to 2.2, only the blue is off a bit.

I tried different brightness and held the phone close and far and what i get is:

R: 2.2

G: 2.2

B: 2.3-2.4
[Nexus 4 Q&A, Help & Troubleshooting] :
AW: Screen Type: Finding it with Franco's kernel

Yeah, small difference, but we definitely have the same screen. Does that make us screen nr. 5? Does anybody have values that might get us to 2.2?
[Nexus 4 Q&A, Help & Troubleshooting] yokuyuki:
Been trying a bunch of other peoples' settings and none of them get to 2.2

Closest I got:

Gray: 2.4-2.6

Red: 2.1

Green: 2.1

Blue: 2.2

Yellow: 2.4

Cyan: 2.4

Magenta: 2.1

This was accomplished with:

RGB: 255 255 255

Whites: 3

Mids: 103

Blacks: 119

Contrast: 0

Brightness: 6

Saturation: 71

Greys: 0
[Nexus 4 Q&A, Help & Troubleshooting] Kel Ghu:
Re: Screen Type: Finding it with Franco's kernel

Try raising saturation and/or contrast one step or two, does it get you to RGB 2.2?
[Nexus 4 Q&A, Help & Troubleshooting] Kel Ghu:
Re: Screen Type: Finding it with Franco's kernel

Maybe. But those differences are so small, one can't tell if it is significant or not. I would say it sounds like Type O.
[Nexus 4 Q&A, Help & Troubleshooting] Kel Ghu:
Re: Screen Type: Finding it with Franco's kernel

Np :)

Though, this thread is not about what looks better. It's about figuring out how or why screens are different.
[Nexus 4 Q&A, Help & Troubleshooting] Kel Ghu:
Re: Screen Type: Finding it with Franco's kernel

Thanks Mendanbar. But I don't know if they are calibrate for RGB2.2 or not. I'm assuming VisceralPsyche's is. Maybe I shouldn't.