I was wondering what does color temperature do to your pixel's RGB/LAB values when you adjust it.
I get that things get more yellow or more blue in the case of temperature, but what equation is Lightroom/Camera RAW using? Is it simply 1-uping the B-channel values for every pixel when you move the temperature up a notch?
My other question is this: I noticed that changing the temperature and tint significantly changed the gray values when I converted my photo to black and white and worked in that space. Other color tools actually add color instead, like color grading, so it's no longer black and white, it gets a cast, and some don't work at all, like saturation. So does that mean that the A and B values of LAB influence luminance values in black and white? I'm guessing that yellow would make things brighter? Is Lightroom changing L values or does it preserve them and generate a preview on top where color values influence gray values?
I'm trying to program a photo software and maybe one day a camera app so I'm interested in what is specifically going on.