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Continue to ChatQuery : GIMP - how to make transparent brush from an image layer? I would like to make a (semi-)transparent brush in GIMP. Starting from an image of marble with white background and veins in shades https://vmapp.org/query/41845/GIMP-How-To-Make-Transparent-Brush-From-An-Image-Layer-I-Would-Like-To-Make-A-Semi-Transparent-Brush-In-GIMP-Starting-From-An-Image-Of-Marble-With-White-Background-And-Veins-In-Shades/