Originally Posted by ppulle
I'd like to see a plugin that takes an epub cover and applies a well thought out halftone to it.
Even though the reader will do it's best in presenting colour images on epaper I reckon that a good half tone will look better.
You'd lose resolution, however we wouldn't get the very dark images some covers render to on ebooks.
A halftone won't do what you want. EInk displays aren't high resolution B&W devices, they are medium resolution greyscale devices. I think you're looking for a high-contrast colour->(4-bit) greyscale conversion.