Søren Sandmann <sandm...@cs.au.dk> writes: > Suppose you have a checkerboard pattern where the squares are 25% and > 75% luminance (ie., measured in linear light) respectively. Then > consider two extremes: > > 1. The squares are so tiny that they are impossible to distinguish. In > this case the pattern will look like a solid 50% luminance, which > corresponds to 186 in sRGB. > > 2. The squares are so big that you can easily see them. In this case, if > you had to choose one color to represent the whole pattern, you > should pick the one that minimizes the overall perceptual error, for > example by converting to sRGB, which is roughly perceptually uniform, > and taking the average, producing an sRGB color of 118.
Looks like I botched the math here. In case 2, the resulting sRGB color would be 179, so there is not that much difference for these values. The point remains though. Using using 0% and 100%, the difference is bigger: 186 in case 1, and 128 in case 2. Søren _______________________________________________ Freetype-devel mailing list Freetype-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/freetype-devel
