yashsingh1/xdaforums huggingface dataset:
[Nexus 5 Themes and Apps] tkoreaper:
You guys are gonna hate me, but I've managed to get extremely close without a formula... Believe it or not we are overcomplicating things because LG has done all the hard work for us... You really only have to change a couple values (at least on my phone) the only problem is cyan which I'm working on. Is it possible that cyan can't be calibrated to 2.2?
[Nexus 5 Themes and Apps] PresidentMcCain:
Since you're that close, try this:

http://xdaforums.com/showthread.php?p=48219304#post48219304
[Nexus 5 Themes and Apps] tkoreaper:
I'm trying to avoid changing the white point. The values you suggest to change effect the gamma so its out of the question when it comes to fixing cyan. The answer lies in green/blue upper or lower values.

Has anyone else noticed the contrast for green is off? Ive tried every value and nothing effects it. Maybe this is why cyan is so difficult?
[Nexus 5 Themes and Apps] NYCguy2020:
Yeah this thread has become overly complicated/technical for most average users myself included. I stopped following it past page 32 or so.
[Nexus 5 Themes and Apps] DoesntPostAThing:
I just felt that none of the colors produced anything better than stock colors. Sure, gamma might be a bit low, but it looks just fine and there was no point obsessing over a few numbers and restarting 5+ times a day because I screwed up somewhere. Any difference was either so minor or just placebo. This is unlike the case on my GNex, where stock colors were horribly yellow. On my N5 at least, colors looked just fine out of the box.
[Nexus 5 Themes and Apps] ChazzMatt:
It's not the colors that look "bad", it's that the blacks are to high and washed out. Plus the colors could pop more. Increased gamma solves that. Crisper blacks, more saturation for the colors.

I'm not changing the hue.

_______

Sent from my Nexus 5 (LG-D820)
[Nexus 5 Themes and Apps] DoesntPostAThing:
I do realize that. Except, I can barely notice a difference. So for me at least, it's not worth the hassle (at least for now).
[Nexus 5 Themes and Apps] darkghost568:
I'm on stock faux settings and I'm still getting a 1.8 gamma on everything. Any advice guys? (Sorry for the noob question but I'm kinda new to modifying RGB curves)
[Nexus 5 Themes and Apps] CRIME INC.:
Mine was also 1.8, I achieved perfect 2.2 by using the values in post #230

sent from my HAMMERHEAD neXus
[Nexus 5 Themes and Apps] jesseb05:
What app is everyone using to test the gamma values?

Display Tester?
[Nexus 5 Themes and Apps] darkghost568:
Thanks man. I'm still getting 1.8s and 2.0s but I think I'm starting to get the hang of this now :D
[Nexus 5 Themes and Apps] lookitzjohnny:
yep display tester.
[Nexus 5 Themes and Apps] tkoreaper:
I think cyan is impossible to calibrate on my screen. I've tried every thing and nothing effects it. I have a feeling I have to offset the gamma of blue or green to get it, but then that color won't be calibrated.
[Nexus 5 Themes and Apps] Chad_Petree:
Does anyone have the settings to try and make the nexus 5 screen look like the G2?
[Nexus 5 Themes and Apps] yorici:
You should try to find out with my linear formula from post 34. Not saying you should use the settings (horrible banding xD), but you could see if you could get cyan 2,2. I could get every gamma for every color using this formula

---------- Post added at 11:32 AM ---------- Previous post was at 11:19 AM ----------

Very good conclusions! Could you specify the two signal paths? I didn't really get that part.

See bold text. Is the last value value nr23 or nr11?

I want to introduce (perhaps unuseful) a new way of thinking about this:

Maybe we should think of this as a whole: You take all the values of red, green and blue to manage white and black (and gray gamma)

You take all the values of green and blue to manage the cyan gamma. So you look at the first value of green +/-, and blue +/-. Shouldn't they be in a sort of ratio to produce proper cyan gradient?

I suspect the following: If one's banding is optimal, one's saturation can't be. Vice versa. Can you confirm this?

And can you explain why red top value is nr13 instead of n12 in stock settings. This has been bugging me for a long time now..

Have a look at the following picture: These are the stock values plotted against nr1 to n23.

The very apparent thing here is that the second segments on all three colors are extremely close together

(https://drive.google.com/file/d/0B2xJTwDD4Mzha3ZVdVhjc1NVOWM/edit?usp=sharing) Upload failed, again *sigh*
[Nexus 5 Themes and Apps] yorici:
I want to introduce (perhaps unuseful) a new way of thinking about this:

Maybe we should think of this as a whole: You take all the values of red, green and blue to manage white and black (and gray gamma)

You take all the values of green and blue to manage the cyan gamma. So you look at the first value of green +/-, and blue +/-. Shouldn't they be in a sort of ratio to produce proper cyan gradient?

Results:

The first 12 values are the most responsible for gamma (as we found out in earlier findings). Cyan is so hard to edit because the green/blue ratio ranges from 0.8 to 1.2, while the red/green ratio for example ranges from 0 to 1.1. Because the differences are lower in green/blue (mix these to create cyan), cyan is harder to change.

Suspicion: The ratio line might be linear for value 1-11. No sudden drops/peeks whatsoever.

Edit: This is very hard to edit. It's easier to try to get green and blue to 2.2.

Edit:

One thing I noticed before is: If red, green and blue are 2,2. Their mixed colors will be too (or atleast very close). As a impulse from the ratio thing above, I returned to my linear formula and the following came to my mind. It seems to me that red is the color creating the most banding the quickest. I could easily use my linear settings 1,74 for green and 1,81 for blue to achieve gamma 2.2, but red is the problem. (I only edit values 1-12 now). I'll try to create a separate linear/logaritmic/something:D-formula for red to achieve gamma 2.2.
[Nexus 5 Themes and Apps] showofdeth:
Man I'm thick! I just can't seem to grasp all this row and column business. Any chance anyone will be kind enough to take the time and effort to post screenshots so a dumb noob tinkerer like me can just copy the settings or at least point me in the right direction? All I want is blacker blacks, slight colour saturation boost and cooler if not whiter whites?
[Nexus 5 Themes and Apps] yorici:
Has anyone noticed this with the white point:

Set it on 30 ==> Normal

Set it on 15 ==> Darker than 30

Set it on 1 ==> Darker than 15

This is normal. The darkness increases when the white point decreases

__

Set it on 63 ==> Brighter than 30

Set it on 64 ==> Darker than 63? :eek:

Set it on 127 ==> Brighter than 30

Set it on 128 ==> Darker than 127

These turning points are not so random though. 64 = 2^6 and 128=2^7

But still, shouldn't this be linear or something?

It doesn't happen on 15-->16

White point 32=100=224 on my screen (optical).

So explanations?
[Nexus 5 Themes and Apps] yorici:
Ah awesome! I get what you mean now. I also had that feeling before when I saw the banding was split in the middle. I'll exprriment with the 12th and 13th value. What do you think of the white point post?

Edit:

Last values: We can lower the brightness with this! I always have though the brightness was a bit too high when 0%.
[Nexus 5 Themes and Apps] mag01:
I tried that white point thing and it basically has an effective range 0-63 (6 bits effectively). Everything above that just gets us back.

0=64=128=192

63=127=191=255
[Nexus 5 Themes and Apps] yorici:
Yeah, seems logical. But about adjusting white point: Should we? Or would that be just subjective?

If you set second value (red) to 200, you get a fine little line in the middle. From middle to the left is value 3-23. I'll try to create some kind of boxplot to map this.
[Nexus 5 Themes and Apps] mag01:
White point - yes that's where you may start - achieve the proper color temperature. Of course without any calibrating device it will be just a guessing..

The middle of the range is actually further, somewhere around the 6-7th value. You may observe that strange line (as well as other effects) even when altering another numbers. It really seems like the bright colors are processed differently than dark ones.
[Nexus 5 Themes and Apps] yorici:
Banding:

So I finished my box plot: I have measured from right to left, setting one value at 200 each time. The middle is value 1 (not 6,7 (recheck it with a ruler if you want:D)) Then there is not a lot of shifting till value 10. Alot of shifting from value 10 to 15. Then again not a lot of shifting.

Value 1 has 50%, value 2-9 have 7,7%, value 10-15 have 31,7%, value 16-20 have 8,6%, value 20-23 have 1,0%. Sum this up equals 99%. The remaining 1% is between value 23 and the edge of the screen. So take these percentages roughly.

Biggest shares:

v0->v1=50%

v13->v14 = 9,6%

Disclaimer:

This test was done once with a simple ruler. Take these percentages roughly or do it yourself.
[Nexus 5 Themes and Apps] MandoH:
Has this been updated to work on 4.4.1?
[Nexus 5 Themes and Apps] markwebb:
Doesn't look that way. I have latest kernel and this isn't working. I am sure an update is coming.
[Nexus 5 Themes and Apps] USHERROB:
I believe the latest kernel here (faux) is not for 4.1.1. I love faux's but for now im using LaboDJ's Linaro r19 (which is half franco/half faux). Linaro r19 and Franco r19 are built for 4.1.1. This app works fine on those, and once faux updates his, will prob work as well.
[Nexus 5 Themes and Apps] mag01:
Works for me at KK 4.4.1 with Linaro kernel r19.

[MENTION=4809179]yorici[/MENTION]

Well, the best is to use color chart at the "Pixel format & dithering" - pefrorm step-by-step modification of just one value and watch what happens. That gave me better idea of what's going on here.

I'll have a colorimeter in about 2 weeks, then I'll try some measurements.
[Nexus 5 Themes and Apps] MandoH:
There is a kernel for 4.4.1... But its nor compatible the app yet....:confused:
[Nexus 5 Themes and Apps] yorici:
I get what you mean now with the 6th being the middle one. But isn't this just the same test as the banding test, but as different composition of colors?
[Nexus 5 Themes and Apps] mag01:
Well, try to find some large (non-circular) image of the HSV color space, like this: http://itooktheredpill.dyndns.org/wp-content/uploads/2010/05/hsv.png - though I believe there are some better ones. But it can be observed on this one as well, just some modifications might not be that clear...

Yes, I'm mainly targeting the effect on the color reproduction to properly understand how these settings actually work. Banding is just a side effect of inappropriate modifications.
[Nexus 5 Themes and Apps] cubskru:
Can anyone tell me what these three numbers corespond to on the app? I know its probably somewhere in the the thread but I looked through like 30 pages of this forum without luck.
[Nexus 5 Themes and Apps] tkoreaper:
After some extensive testing I have come to the conclusion that the ONLY values you should change is row 2 column 5 and r3 c1. After that you can adjust r3 c2 to a number higher than the previous one until you get the results you want. Each number should be higher than the next. I'll post my settings in a moment.
[Nexus 5 Themes and Apps] rsa 329:
Works for me, nearly 2.2.
[Nexus 5 Themes and Apps] yorici:
Completely confirmed

I get what you mean, but this would indicate that we can't control the whites, other than lowering the blacks.
[Nexus 5 Themes and Apps] Globespy:
I had asked the same question on page 30 or 31, but here's the answer.

Hope it helps.

Just click each value in the respective tabs (positive/negative) then apply before moving on to the next tab, then go back to the first tab and set on boot if you like the colors

http://xdaforums.com/showpost.php?p=48156884&postcount=319
[Nexus 5 Themes and Apps] yorici:
Well if you have a look at the first page for example, you will see that the three numbers correspond to row 1 column1, row 2 column 5, row 3 column 1

Leave the rest as it is. Change white point if needed and check results with displaytester app.
[Nexus 5 Themes and Apps] tkoreaper:
Back with my settings. Everyone give them a try. I understand that not everyone's display is the same, but this should get you close or, at the very least, make it easier.

Settings: (Row 2: Column 5 - Row 3: Column 1 - Row 3: Column 2)

Red (113-125-131)

Green (122-130-137)

Blue (124-131-136)

White Point 32

Keep in mind that you will not get 2.2 on Cyan. Someone had explained earlier that it's near impossible unless you have an extremely high gammut display which ours are not.

If these don't give you 2.2 everywhere then quote this post and tell me where you're at and I'll help you get there. My general rule of thumb is if the 2.2 position is too bright then you need to add 1 to either Row 2: Column 5 OR Row 3: Column 1. Doesn't really matter which, but I would try to stagger the increases so if you increased one and still need to add more then increase the other. Don't touch anything else. Obviously, if the 2.2 position is too dark then you should do the opposite.
[Nexus 5 Themes and Apps] yorici:
Could you specify your findings: Why you think those are the only values to be edited? Why those values and not higher (how they were determined) etc? Thanks in advance

My results:

Gray: 2.2

Red: 2.6

Green: 2.3/2.4

Blue: Perfect 2.3

Yellow:2.4

Cyan: 2.2 (It does not blend in that well, but it is closest to 2.2)

Magenta: Between 2.4/2.6

Banding: 2 very small bands (hardly noticeable though)

Saturation squares:Little bit better than stock

Black contrast: Good

White contrast: (Green no separated blocks)

Saturation test: Red and blue sometimes not distinguishable

Pixel dithering: There is a line visible now that is not visible in stock
[Nexus 5 Themes and Apps] paulkono:
Are the Red/Green/Blue for the positive or negative tables?
[Nexus 5 Themes and Apps] yorici:
Probably the same
[Nexus 5 Themes and Apps] tkoreaper:
The reasoning is pretty simple. The ONLY values that effect gamma itself are values 1 (slightly), 10, and 11. Changes to everything else can cause a lot of banding and only messes with the stock "blending" which is already done extremely well. Changing anything else will effect grays which in turn is the balance of colors which are very delicate.

Follow my directions in my post and I'm sure you'll achieve 2.2 across the board and you shouldn't find any problem with the grays. Banding is almost unnoticeable.

---------- Post added at 04:28 PM ---------- Previous post was at 04:28 PM ----------

Same for both.
[Nexus 5 Themes and Apps] yorici:
You are absolutely right! The gamma is indeed only controlled by those values. Changing all the other values to 0 has no effect on gamma!

Did you just try out a lot of settings and came to this? And you give as adjustment to change value 10 and 11, but not 12 (r3,c2) Why not that one?

But do you think we can adjust other things like saturation, banding, contrast with the other values?
[Nexus 5 Themes and Apps] tkoreaper:
Value 12 effects the topmost portion of gray which can be effected by the changes to the gamma. Without upping the values from stock your dark gray may be off (not exactly gray, but red or green).

I have not found anything that effects contrast. I tried finding something for green because it too bright, but it may be just because our displays are high gammut and its most likely why we can't achieve corrected cyan.

This is all just an accumulation of a ton of trial and error and taking not of how things work. If you can't get 2.2 with my settings or by using my method then there are other things in play. If your grays are not gray and have a tint of color then let me know and I can tell you how to fix it.

The banding itself is a result f changing gamma. By default are gammas are ~2.0 and because we change it to 2.2 we are essentially bringing the blacks down. Take note of the color display using the display tester app before and after and you'll see what I mean.
[Nexus 5 Themes and Apps] yorici:
Yeah, I already achieved 2.2. I was just wondering about value 12. But what do you think is the meaning of the other 20 values? (other than correct whites and blacks)
[Nexus 5 Themes and Apps] mag01:
[MENTION=3332811]faux123[/MENTION] [MENTION=4152171]myfluxi[/MENTION]

Hello, are you guys sure you've got those variables and their values right? Because based on my tests it works as shown on that attached chart and that's very strange and I still don't get it why it is like this:

- First, the order of these numbers is reversed as first value matches white and the last (23rd) one matched black. Usual order is the opposite.

- Second, at 6th number we already reach 50% of the gradient - they have roughly logarithmic progress on the X-axis. (that's probably right)

- Third, between 12-th and 13th numbers the effect of any corrections is reversed, From 1st to 12th number when we increase the value, we get darker color in response. From 13th to 23rd value when we do the same, we get brighter color instead. If we put the numbers into the graph (provided below) we'll see a strange peak here. That doesn't make any sense to me.

Moreover there are few other weird things about how this thing works, especially when it comes to modifying the 1st value, but that's probably just how it is.

Postitives vs negatives - that's also quite strange thing that such things exist. They have roughly the same effect each (with minor shift on the X-axis) and when they're modified simultaneously their effect is cumulative.

EDIT: One minor addition: the effective range for the white point adjustment is 0-64. When you go beyond that you just get exactly the same results again (0=64=128=192 & 63=127=191=255)

Note: attachments don't work again, let's hope they will start working later, otherwise I'll upload the chart somewhere else and post a link.

EDIT: Uploaded here: http://i.tinyuploads.com/Ijb0cT.png

EDIT: Basically I believe there's a bug somewhere that causes that strange jump between 12th and 13th numbers.

Here is the proposal of corrected graph that shows how it should probably look like: http://i.tinyuploads.com/uVDpZ4.png

The numbers would be then:

CURRENT:

RED: 0, 10, 17, 27, 37, 45, 56, 72, 83, 101, 112, 121, 128, 123, 117, 106, 91, 78, 68, 62, 53, 38, 22

GREEN: 71, 73, 75, 78, 81, 84, 90, 100, 105, 117, 124, 130, 121, 117, 111, 100, 85, 73, 64, 58, 50, 37, 21

BLUE: 86, 87, 89, 91, 94, 96, 101, 109, 111, 121, 126, 131, 120, 116, 110, 99, 84, 71, 61, 52, 40, 33, 20

CORRECTED VALUES (1st to 12th = 255 - current):

RED: 255, 245, 238, 228, 218, 210, 199, 183, 172, 154, 143, 134, 128, 123, 117, 106, 91, 78, 68, 62, 53, 38, 22

GREEN: 184, 182, 180, 177, 174, 171, 165, 155, 150, 138, 131, 125, 121, 117, 111, 100, 85, 73, 64, 58, 50, 37, 21

BLUE: 169, 168, 166, 164, 161, 159, 154, 146, 144, 134, 129, 124, 120, 116, 110, 99, 84, 71, 61, 52, 40, 33, 20

CORRECTED ORDER (opposite):

RED: 22, 38, 53, 62, 68, 78, 91, 106, 117, 123, 128, 134, 143, 154, 172, 183, 199, 210, 218, 228, 238, 245, 255

GREEN: 21, 37, 50, 58, 64, 73, 85, 100, 111, 117, 121, 125, 131, 138, 150, 155, 165, 171, 174, 177, 180, 182, 184

BLUE: 20, 33, 40, 52, 61, 71, 84, 99, 110, 116, 120, 124, 129, 134, 144, 146, 154, 159, 161, 164, 166, 168, 169
[Nexus 5 Themes and Apps] yorici:
What do you think about the findings of tkareaper?
[Nexus 5 Themes and Apps] mag01:
Well, I read what he wrote and also checked his values and that isn't really right as well. He alters values around the most sensitive area to the gamma (around 60-70% of the range, see for example here http://www.chromapure.com/colorscience-gamma.asp), however by altering only those 3 values he breaks the gradient smoothness and I can see it on test images (on that HSV colorspace diagram for example). It's basically because he primarily targets gamma values and doesn't fully take other things into account.

To increase the gamma properly you need

- increase values somewhere around the 9th number - that should be the center of your corrections

- increase other values towards the 1st number proportionally (less and less towards the 1st number)

- increase other values towards the 12th number proportionally (less and less towards the 23rd number, but stop after 12th)

- continue at 13rd number by following the same logic which you used in the previous step, just switch to decreasing the remaining values instead of increasing them

Then verify the gamma value and perhaps make some additional corrections.

And it would be better do something like a draw a graph of the intended changes and prepare the values mathematically (like you did in your experiments not a long ago).

But first you should review the white point - if you're satisfied with the current state, or you want to make it more bluish, or yellowish. Then review gamma values and perform the required corrections.
[Nexus 5 Themes and Apps] yorici:
Well i had set all the other values at 0 and I barely saw difference in gamma:S I know it shouldn't be like this and I'm more fond of mathemathical procedures as well, but this is getting more results at the moment. Whilst the internet says it should be logarithmic, I have more succes at linear formulas. So either faux or myfluxy have missed something or I shouldn't use a*x^2.2... (I know, gamma correction and all the tweaks lg does after the formula, but plotting the points looks more linear to me than it looks logarithmic.)

There should be noted that I won't develop more formulas until myfluxi, faux or franco have responded to all the findings we have made (+ I have less time on weekdays) As you said, it just isn't right in some manner
[Nexus 5 Themes and Apps] loganno:
When I try these values ​​on the left page of the launcher, where we find google search, I see a green line at the bottom. How so? No value is fine:confused::confused::confused::confused::confused: