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Sorry, super basic question here.

I'm trying to make an animated brush. When I export in Grayscale mode, I'm able to change the color, but it fills in the background so I get a bunch of different-sized squares. When I export in RGB mode, I get my images just fine but of course I can't change the brush color.

All the tutorials I can find cover either animated brushes OR color changing but not both, lol. How do I fix this?

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Ach, got it. Background has to be white.

Hi, KesonaFyren
Gimp has official tutorials:
https://www.gimp.org/tutorials/Custom_Brushes/
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If you want to use color, please use Grayscale Mode and Transparent Layer.

Colors menu: Color to Alpha, Remove the white background.
Obviously, the background of the image you use is not transparent.

P.S.
(Using transparent background can avoid many problems. I only use transparent background to make it.)
(After saving with transparent background, GIMP will be automatically converted to white background. Just found out )