Documentation

The Add and Sub drawing modes

The Add mode adds the R,G,B,A values of the current tool with the A color to the R,G,B,A values of the source image pixels. The result is the image shown on the left.
The Sub mode subtracts the R,G,B values of the A color from the R,G,B values of the source image pixels. The result is the image shown on the right.
Here the A color is purple: R=128, G=0, B=128.


Airbrush tool in Add modeAirbrush tool in Sub mode