Layers Dialog / Layer Blending Modes / PCB Blend Modes

§ - PCB Solder Mask

PCB (printed circuit board) Solder Mask layers are transparent where no RGB color component is below 1/2 intensity. The alpha channel is ignored. The Opacity control can adjust the transparency of the layer.

PCB layer modes cannot incorporate positional offsets.

Note: Because the Gerber file CAM files are bi-level, there's no such thing as a partially-on level, no matter what. So when working on printed circuit board layer types, areatool antialiasing does not function, regardless of the actual setting of antialiasing for the particular areatool in use.
See also: PCB Copper
PCB Legend
PCB Drill Holes
PCB Board Profile
The Layer Clear operator
The Valves operator
The Pad operator
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PCB Solder Mask layer