So, yeah, that's the thing. How do you allocate a colormap that makes sense?

*stares blankly*

I guess I naively thought that the JPG/PNG libs themselves would have options available for color-depth reduction and dithering. But upon further inspection I guess that's not the case. I think the GD graphics library I use in empan takes care of things automagically.

I'm not sure that dithering will even make much of a difference on a 128x32 screen. Maybe just calculating the intensity of each pixel and converting that to the closest "empeg color" would be a good start? So if pixel A is (255, 0, 0) and pixel B is (0, 0, 255) they'd look the same on the empeg display, but probably both be dimmer than a pure white pixel (255, 255, 255). Not sure how beautiful the results would be, but for a first crack at things, I'd try that, and then maybe look into how tough it'd be to add a dithering algorithm.

A few prayer sessions to the Google Gods found me this

http://thorkildsen.no/faqsys/docs/dither.c

Any help?