16 Aug
2019
16 Aug
'19
4:10 p.m.
Hi, Am 15.08.2019 um 17:14 schrieb David Miller via colorsync-users:
When you do this, use a 256 grayscale image with evenly spaced steps in Preview.
Note that Apple's ColorSync assumes sRGB as source colorspace for untagged images (which is reasonable). So...
0 0,0,0 (correct) 1 14,14,14 (….wrong….should be 1,1,1) !!! 2 16,16,16 (……wrong…should be 2,2,2) !!!
...this alters the nominal RGB values slightly (sRGB -> AdobeRGB): sRGB 1,1,1 should be AdobeRGB 6,6,6 (rounded up) sRGB 2,2,2 should be AdobeRGB 9,9,9 (rounded up) etc. Doesn't of course change that there seems to be something wrong with Preview, either way. -- Florian Höch