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Irex E-Ink display is 4-bits grey, so what you see is 16 colors image. If we will convert it straightforward to 2 level black/white it not always will enhance image quality, better will be to use algorithm for enhancing contrast.
The problem: processor used in IREX ebook (and actually in every ebook) not designed for heavy image manipulation, it's too week. Better approach would be offline enhancement of djvu book using more advanced tools for it.
In sources of djvu plugin I see that luite tried to enhance image by converting it to 4-bits before display. This code in comments, maybe something not work as expected, or his algorithm too slow.
Sincerely
Yura
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