Gallery is unsuitable for an ereader, it's really for shops etc.
Kaleido 3 is suitable for 10″ or larger ereaders with front light on where most of the reading is comics/graphic novels. It trades saturation for brightness. Less than 4096 colours/shades and lower resolution by physics due to colour filter on a 300 dpi screen.
So there is no significant static colour screen since Mirasol (dead) and Gallery (clever C Y M but inherently too slow for an ereader).
Colour eink is a niche in a niche.
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