Line art is e-ink's strength, which is why it's featured so often in adverts or boot / sleep screens. Durer's rhinocerous is phenomenal on a high-quality, large e-ink display.
Most photography would benefit by being run through a halftone filter. That's default in "Regal" mode, though "Normal" (highest-quality) mode doesn't do this, and the result is a somewhat posterised image (16-shade greyscale on my Onyx BOOX Max Lumi). Dithering would be another option, and might work.
Onyx's most recent image update (as of a couple of days ago) has some improvements in image display which apply to its book reader (NeoReader), and seem to be an improvement.
Video should be presented at A2 or X mode. Though quite honestly, animation and e-ink are usually a mistake. As jarring and distracting as animation is on an emissive screen, it's pure anger-fuel on E-ink.
Most photography would benefit by being run through a halftone filter. That's default in "Regal" mode, though "Normal" (highest-quality) mode doesn't do this, and the result is a somewhat posterised image (16-shade greyscale on my Onyx BOOX Max Lumi). Dithering would be another option, and might work.
Onyx's most recent image update (as of a couple of days ago) has some improvements in image display which apply to its book reader (NeoReader), and seem to be an improvement.
Video should be presented at A2 or X mode. Though quite honestly, animation and e-ink are usually a mistake. As jarring and distracting as animation is on an emissive screen, it's pure anger-fuel on E-ink.