[Nexus 5 General] yorici:
Hi thx for trying this.

About my method:

I know that this can be a pain in the ass sometimes.I first look at the values roughly. It's great that you took a profile that was close to 2.2 gamma as base. That helps a lot.

What I tend to do when I need smaller changes is this:

Let's say I have 146,146 (pos, neg). If I need a small change downwards, I can change it to 145,147. Note that if I change this to 147,145 the change is even smaller starting from 146,146. Sometimes you can also stick one value and lower the other one. Each time you lower it, the change gets smaller.

Also, I recommend measuring 20 values at least for final measurements! I rather see 100 or 256. The reason for this, is that at both ends of the curve. 10% covers like 6 parameters. If there are any mistakes, these won't show up at when you measure with 10% intervals. (You can more easily measure 100 values by using Free Measures, and then copying over these free measures to the Grayscale tab).

_________________________________

About the RGB controls:

This is how they work:

I'm assuming that you are a bit familiar with the RGB curve. It ranges from 0-255 and has three channels: R, G, B. What the control does if you set R to 200 is that the range is updated to 0-200. Normally 256 colors are distributed over 256 positions, now just 201 colors over 256 positions. Result: banding

Another side effect is this: The parameters have RGB values assigned to them. These now get redistributed. If you were to change a parameter now, it wouldn't adjust the same values. Now this can be calculated (I assume. These things usually works according to logical math).

So far so good to me. Setting it to 234 means that 256-234=22 bands will appear. If you can live with that, as they are small, fine with me. If the RGB controls is your final adjustment, it works fine.

But there is more.. And here is why I oppose this in your situation. Your color temperature was too low in the first instance. You applied RGB controls and it got 6500K. The application of RGB controls lowered red and green, while blue remained the same.

Typically red can go to a max of 410 cd/m2, while green and blue can go much higher. Red is the limiting factor. Therefore you should keep the range as maximum as possible. By applying RGB controls, you are lowering red. The result: A decrease of maximum brightness you can produce. You should measure how much this is compared to red being maxed out. (Stock has red maxed out). So compare what you made with stock).

_________________________________

If you can live with all of this

, that's fine. The latest FKU does save these changes in a profile and sets them on boot. Furnace kernel has also a little trick for this. Whatever works for you.

If you can't live with this, this is what you should try to do:

First you should try to set the first parameters to 6500K. Then you have a base for gamma 2.2. And you must know sure that these will get you 6500K every time (so be super OCD accurate for this one RGB value).

Now you have three options from here:

- Go perfect 6500K

- Go perfect 2.2 gamma

- Go hybrid

The reason that you can't go perfect 6500K and perfect 2.2 gamma is that the minimum luminance (the output at full black) is not the same for red, green and blue. This means the color temperature at full black is not 6500K. This does not matter that much though, as it's black!

If you are going for perfect 6500K, you must adjust the luminance for all values to be the same level.

If you are going for perfect 2.2 gamma, you don't pay attention to the relative levels of red, green and blue. Just focussing on 2.2 gamma

I prefer the hybrid option: You aim for 6500K and gamma 2.2 (is possible) for parameters 1-13. Below parameter 13 you pay more attention to getting the right gamma, because color temperature matters less with shadows.

(I know this is all painfully annoying work. That's why the accurate profile takes so long. I get tired of seeing values:P Therefore it's on my list to discover the math behind the values)