Colors get distorted when converting from an animated PNG into an animated GIF

[idest]

Try converting the attached animated PNG file, spiral.png, into a GIF animation with the command

ffmpeg -i spiral.png spiral.gif

Notice that in the resulting file, spiral.gif (also attached), colors are distorted: almost all the curves are in yellow.

Reported FFMpeg version: N-118325-gea381285e7-20250119,
OS: Windows 10 Home.

[Leo Izen]

This is caused by the automatic converstion from rgb24 to bgr8, which is the default for the gif encoder. bgr8 cannot represent the colors correctly. Use this instead:

ffmpeg -i spiral.png -vf 'split[v],palettegen,[v]paletteuse' spiral.gif

The original picture only has 60 colors so this shouldn't create any loss.

[idest]

Thank you for the explanation, Leo, your command produces the desired result.