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Is it possible to invert a custom brush?
I am not talking about angle/rotation/horizontally but what part of the brush is drawn on the canvas.
I want to invert it in a way so the area which normally does not apply color will apply color.

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A workaround: Paint black into a originally white layer mask. Have a new layer with white layer mask and the layer itself filled partially or fully with the new color. The layer must have alpha channel.

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  • Windows>Dockable dialogs>Brushes
  • Right-click the brush, and Open brush as image (image should be grayscale)
  • Color>Invert

Two ways to use the brush:

  • One-time use:
    • Select>Select All
    • Edit>Copy
    • Use the clipboard brush (first in list)
  • Long-term use:
    • File>Export as .GBR, in one of the directories listed by Edit>Preferences>Folders>Brushes (the one you can write into).

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