Choose by mask
A node of the Style graph, in the Mix group.
Takes one input where a mask is on and the other where it is off; mixing never makes a new colour.
Takes: a (layer), b (layer), mask (mask) · Gives: layer
What it wires to
Its a input takes a layer, which these give: CRT, Output, Cleanup, Combine, Lines, Mesh edges, Shading, To palette, Dither mix, Flatten, Hatch, Layer, and 17 more.
What it gives, a layer, goes into: CRT, Output, Cleanup, Combine, Lines, Mesh edges, Colour edges, Dither mix, Flatten, Layer over, Paint, Palette, and 9 more.
In the app, drag a wire from one of its dots: every dot the wire fits is ringed.
How it fits with the rest: the Style graph in the manual.