Hi,

I remember reading an e-mail about image compression
on the gba. I will share the alternatives I found
regarding image compression.

I just discovered the PNG format (no licence needed, no
royalties to give, absolutly free) It's mission is to be
a substitute to the GIF format. it's decompression doesn't
look demanding at all (in time and in size). It is looseless
and it offers compression results comparable to looseless jpeg
(apparently, it sometimes gives a 2:1 ratio)

I even more recently discovered the CBA format (right about now
actually) it looks amazing but I didn't take a look at the specs
in detail yet (check out: www.coreba.com) also absolutely free.

I also thought of the alternative of having paletted images.

By having a global palette (with the indexes expressed on 12-bits)
It would enable me to have 4096 colors out of 32768 with 12-bits
per color. Obviously, such palettes are big and it would be too
expensive to carry one for each picture, that is why all my pictures
must share that same palette.

It would give an almost effortless 4:3 flat ratio. Also paletted
images can pe compressed further and probably with more compressability
since the colors are quantized.

I am still wondering if 4096 colors would be enought. The concession
is hard to make.

Anyways, that's what I had to say about image compression, I hope it
gave you ideas or info that helped you or motivated you.

Vince

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