Lightmap banding


I’m baking a lightmap to use in a game engine but it there’s this horrible banding I can’t get rid of:

(it’s actually worse in my game because the textures make it darker and that makes the banding more noticeable)

I tried a lot of things but nothing works:

  • This is a 24 bit PNG image (8 bits per channel) so it’s not because of low color depth
  • I tried the “Dither” option in blender but it doesn’t seem to work on baked images
  • I tried adding noise in Gimp but in order to remove the banding, I need to apply ridiculous amounts of noise
  • It’s not just in Blender, it also shows up in Gimp or in my game

Thanks for your time.