Holding Shift (or Ctrl) to move RGB sliders together in Color panel doesn’t work when color is white
A Help article on Color panel states we can hold Shift (also works for Ctrl, although unspecified there) to move color channels’ sliders 'in tandem', together, — http://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html#keys_for_the_color_panel
This indeed works, in both RGB and CMYK modes (not in HSB, since its values won’t benefit from it).
However, if all three RGB sliders are at 255/100% (white), this mode doesn’t work — please see the GIF attached.
It probably makes sense for CMYK, where it’s not clear if 0-0-0-0 should become something like 24-24-24-24, but it totally makes sense for RGB, where we expect to get a gray color.
Thanks to Franck Payen for bringing attention to this old problem. It’s not as irritating as others, but still it should be fixed.
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Affinity Designer does it worse, BTW.
If any slider is at 255, holding Shift won’t work.
And it won’t work for clear black, unlike in Illustrator, — at least one slider ahve to be non-zero.