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Color eink is only good for comics. It reduces the text resolution and has only about 4000 pastel shades because it's a filter printed on top of mono eink, which is at best 300 dpi with black, 14 grey levels and nearly white. So you either get 100dpi x 300 dpi (X by Y using RGB) or 150 dpi (X & Y using G B then R G on alternate lines). Triton gives more saturation but needs strong lighting and Kalido uses pastel shaded RGB to make it not quite as dark (but still need front light or strong ambient light).
Gallery 3 is OK for posters but poor for an ereader at about 1.5s for a page turn/full refresh. It's aimed at retail & advertising, though of course the Eink company will sell smaller panels to bleeding edge ereader makers and it will be a failure.
Javascript needs epub3.
A better quality LCD or OLED with matte finish screen is what you need for colored text.
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