None of the reading apps do a full page refresh. After a while the text isn't as sharp and there are noticeable artifacts. Is there any fix for this?
I think I remember CoolReader running on my rooted Nook Simple Touch with full page refreshes. I don't have it anymore so I can't check. Perhaps for some reason the apps that are designed to function a specific way with an eInk screen do not realize they are being run on an eInk device? Hmm...
I'm running Angor's image (dated 2014-02-28) on my Kobo Aura HD.
Edit: Looking at CoolReader's description in the Play Store, one of the updates reads, "EInk devices support improved." I suppose the app is designed to know when it's running on a device like a rooted Nook or Sony reader. It must not recognize this modified Tolino image as an eInk device (under the About section in settings the model is listed as "Nexus S" ... perhaps this is why).
Oh, and I found a video confirming the existence of full page refreshes in CoolReader on the Nook:
https://www.youtube.com/watch?v=J8RVpAag9zw