Meh, that's lossy as fuck. You might as well shrink it and display it stretched with a linear filter and you'd get better quality for roughly the same size.

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd

> 02 Walsh matrices to use (1 nybble per channel)

So I take it you use 4 bytes per channel, that is, 12 bytes.

If you add one bit per channel, you'll be able to use more matrice types without needing more space.


Also, your example image isn't a very good example given the compression method you're employing. Your format would work best for photographs. (for something like the drawing you used, a paletted format with an appropriately sized palette and LZ77 type compression would be very efficient while preserving the image's quality)

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd

Another possibility would be to replace the Walsh matrices with more common patterns.

Or take it even further and convert the image to tiles.

Dunno.

____________________
NSMBHD - Kafuka - Jul
melonDS the most fruity DS emulator there is

zafkflzdasd