What general algorithm do they use? When you brighten a dark image, it increases the luminosity of dark pixels more than the bright ones. The bright pixels are not allowed to reach or surpass full white.
Any ideas?
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What general algorithm do they use? When you brighten a dark image, it increases the luminosity of dark pixels more than the bright ones. The bright pixels are not allowed to reach or surpass full white.
Any ideas?
Preliminary testing shows that it is based on the luminosity histogram.
All it does is shift the luminosity histogram over.
The amount -100..0..+100 is the amount of the shift (where the historgam exists from 0..255). So, it has nothing to do with a %. It's just -100..100 of 255.
It's even more simple than that. It just adds x = -100..100 to R, G, and B, and bounds them to 0..255, with no regard to the fact the hue changes.