One more thing - setting page refresh to "no animation" actually isnt needed for a sharp image, on either comic viewers (f.e. Perfect Viewer), or ebook readers. It all depends on contrast and kerning settings. Leaving on animations softens the image a little - but with the "right/wrong" settings, this eReader can actually bolden fonts and images (edge contrast) too much - so if you then enable animated transitions, it actually gets better...
(found out in setting Perfect Viewer settings).
So presets/contrast settings are all that matters. Its not as easy as "you have to disable any animations - always" - thats just the shortcut for people that dont know better.
Gradual contrast settings that actually stick - are "the king" on this device. Any app that doesnt support those will end up with a potentially worse than necessary image result in the end.
Also - the "correct" settings depend on backlight brightness (you can make the lines "darker" if you have your backlight brighter) - which also depends on actual content. (You need to set it brighter for comics or mangas, less bright for ereading.) So have fun.