"Eric there are a number of settings that can be adjusted to have the brush hit white canvas only. Check out the various start probabilities, Path Application Probabilities and the Path End settings. Beyond those you can already paint on alpha to the…"
I would think it could be used as a brush targeting variable (i.e. put stroke placement priority on alpha). This way when auto painting is used with this option enabled it should fill the canvas more quickly in many cases. I realise it's not useful for all brushes... such as outline sketch type brushes. However, I have so wanted some way for brush placement to fill unfilled areas first with the majority of paint presets as it is a good way to lay down a back painting. As is it can take much…See More