On 01/22/2016 09:30 AM, Jehan wrote:
On 2016-01-22 13:25, Sven Claussner wrote:

- A pure white theme would reflect the proper appearance of the image
printed on white paper.

Monitor "pure white" has the absolute colorimetric LAB L value L=100 (#FFFFFF). "Print paper white" has an absolute colorimetric white that's less than L=100. So it might help to have some reference points for print paper white.

For ten moderate to high quality "printer/paper combination" profiles downloaded from the internet, ArgyllCMS's xicclu showed "print paper white" values ranging from L=90 to L=98. Most of the values were around 91 to 93. I'm a bit suspicious of the higher values (fluorescent whiteners?), but I'm not an expert on print paper.

If one goal for a Light theme is to emulate "print paper white", then expressed as sRGB and HTML colors, the basic color of a Light theme might be somewhere in the range of:

LAB L=90, sRGB R=G=B=226, HTML #e2e2e2
LAB L=91, sRGB R=G=B=229, HTML #e5e5e5
LAB L=93, sRGB R=G=B=235, HTML #ebebeb
LAB L=95, sRGB R=G=B=241, HTML #f1f1f1
LAB L=97, sRGB R=G=B=246, HTML #f6f6f6
LAB L=98, sRGB R=G=B=249, HTML #f9f9f9

In an actual paper print mounted on a wall, the print might not have any "paper white" highlights. If the mat around the image is white, I will guess that "mat white" is less bright than high quality printer paper white. So if the goal for a Light theme is to emulate what a paper print might look when displayed with a white mat, a Light theme might aim for L=90.

So should the whitest theme be even whitest? ("pure white" #FFFFFF even?)

Even the lightest theme probably should be less than "monitor white", to allow the image highlights to be at least a little brighter than the theme colors and to avoid eyestrain from staring at monitor white for hours at a time. Maybe aim for around L=93-95 for the lightest theme?


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