Distance

Distance Falloff

Activate the Distance Falloff setting if you want the strength of the brush tool to abate along the length of the brush stroke.

Distance [0..+∞]

This is the distance in screen pixels over which the falloff (or the abatement defined with the Distance Falloff graph) will occur within a given brush stroke

Falloff

The guides pictured above are influence by the Distance curve below (Kink mode).

The Distance curve defines how the strength of the brush tool will be varied over the length of a given brush stroke, as defined by the Distance value.