Png:gAMA: gamma=0.45455 (See Gamma, above) Let's check the gamma: identify -verbose start.png | grep -i gam # ImageMagick pixel enumeration: 1,1,65535,gray Let's make a single pixel image with value 100 so we can see what happens to it when transformed: convert xc:"gray(100)" start.png I think I see what is happening - in a nutshell, I don't think the PNG encoder is picking up the gamma correctly. Identify -verbose tmp.png | grep -i -C5 gam I also don't understand why this: convert start.png -set png:gAMA 2 -verbose info: | grep -i -C5 gamĭiffers from this: convert start.png -set png:gAMA 2 tmp.png
I have been experimenting some more and I am not sure this answer is correct, but I'll leave it a while so that Fred and Eric and Glenn can see it and maybe correct it or comment on it.
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