The color of gray
The color of gray
- Subject: The color of gray
- From: Peter Miles <email@hidden>
- Date: Sun, 31 Aug 2014 00:25:55 -0700
Hi List members.
I'm in the process of doing some spring cleaning. I'm pulling out some my old ideas that around color that I haven't examined for a while and asking myself if they are really correct. I'd appreciate it if you would read the following and kindly point out any misunderstandings / half-understandings on my part.
The Color of Gray
I am a bit suspicious of my current ideas around the concept 'gray' after asking myself if the following was really true...
"That in an editing RGB color spaces, such as AdobeRGB 1998 and ProPhoto RGB, that 'equal RGB pixel values equal gray'.
QUESTION 1
My current understanding is that this statement is true. But they are gray only relative to the white point of the colorspace. Because AdobeRGB 1998 is D65 and ProPhotoRGB is D50 the color of ProPhotoRGB 'gray' is different to the color from Adobe RGB 1998 'gray'.
I attempted to test this (expecting to fail) by making up some gray ramps in photoshop in both ProPhotoRGB and AdobeRGB. I wasn't too surprised to see no color difference between the grays of ProPhotoRGB and AdobeRGB 1998. My understanding for this failure to see a difference is that the 'whites' of both colorspaces are being scaled relatively colorimetrically to my monitors white. Is this right?
QUESTION 2:
So am I correct in the following
My Eizo monitor being set to 5000K will show me the color of the gray in ProPhotoRGB (D50 white) more or less correctly, in an absolute sense. And when my Eizo monitor is set to 5000K, the monitor color displayed for my AdobeRGB 1998 grays is incorrect. In an absolute sense. In that the grays will be displayed warmer than they should be given that Adobe RGB white is D65.
QUESTION 3:
I'm not near my printer to test this just now, but I'd expect AdobeRGB 1998 and ProPhotoRGB gray to print gray with different color with absolute colorimetric rendering?
Thanks for your time. Regards
Peter Miles
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