Missing description of brush mapping
Submitted by Andrew
Link to original bug (#763520)
Description
There is no description of the conversion of a GIH brush image into an actual brush. I would suggest putting it in sec. 7.8 with the GIH dialog window. The needed info is (1) that a grayscale image should not use transparency, but rather black for the brush and white for transparent (and gray for intermediate values). Then, when stroking, the brush takes on the current foreground color.
(2) An RGB image should use transparency. The stroke is transparent where the brush is. The stroke ignores the foreground color and uses the colors stored in the brush.