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I was thinking maybe the same way it shows results with analyze=true it could show the parameters used from the autowhite result. So If I could expose the results or values that colorYUV applies when running autowhite on one specific frame cropped to a section that is just white like a section of their eyes, then I could take those results and apply them to the entire clip. (I am still new to all of this, so please correct me if im wrong) because the U & V are for the colors and the Y is for the brightness/intensity as I understand it. I can see that the values for Y did not change, so my gut is telling me that the brightness/contrast is not changed, only the colors. I did a little test ( these are the section of eye seen above, cropped and enlarged.): My question first is about the autowhite feature of colorYUV, does it adjust brightness or contrast? or does it only adjust the color to restore white/greys (hoping just color) Then get the coordinates within that frame that are just the eye. What I do first is find a frame that shows a nice close up of their eye, something that should be white/grey without color. Using only ColorYUV would allow me to skip converting to rgb and then back to yv12. The Idea I got was to take the results of ColorYUV(autowhite=true) for a section of a particular frame, and apply that to the entire clip (the same idea from Ashura's guide on kanzenshuu) We can do any kind of contrast/brightness adjustment later in a more controlled fashion.
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The reason we do not want to do a straight white balance is because we do not want to change the overall tonality of the colors we just want to remove remove the excess color added by the aging but keep the brightness/contrast as close as possible as to what's on the Dragon Box already. In that guide it makes a very good point: