How can I apply this to channels? As a matter of fact, what value should I even read when sampling a channel to know what value that pixel has? With sRGB as a working space, K=50% in the Color palette set to Grayscale returns HSB=0%,0%,63%, RGB=160,160,160 and Lab=66,0,0 in the color picker. Conversely, B=50% in the color picker becomes RGB=128,128,128 and Lab=54,0,0 in it too and 64% in the Color palette. If instead of standard sRGB I use a customized sRGB with gamma set to 1.0 as a working space, things are not any more clear. K=50% becomes HSB=0%,0%,35%, RGB=89,89,89 and Lab=66,0,0. Conversely, B=50% becomes RGB=128,128,128, Lab=76,0,0 and K=37%. Isn't there a mode where B=50% = RGB=127,127,127 = Lab=50,0,0 so that the inverse is exactly the same as the input?
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