Colors in animated gif

Hi,

Newbie question here: I’ve been able to get my single 128x64 panel (ABC, FM6124) more-or-less running from a Pi4.

Unfortunately, I’m still having some trouble with animated gifs. I’ve tried endless combinations of parameters, but the closest I get is this:

sudo ./led-image-viewer --led-rows=64 --led-cols=128 --led-chain=1 --led-parallel=1 --led-row-addr-type=3 space.gif

Here is the original:

space

Here is my outcome: LED Matrix - Album on Imgur

Any suggestions on what might be the issue would be much appreciated – thanks!