Layers Dialog — .elx Files / Layer Blending Modes / PCB Blend Modes

§ - PCB Board Profile

PCB (printed circuit board) Board Profile layers are always fully opaque — no layer below them will be visible in the master image. Layer content with any channel below half-intensity will be displayed verbatim in the layer stack and will be treated as board profile information by the Gerber file exporter; content above half intensity will be displayed in the layer stack as white (255,255,255) and ignored by the Gerber file exporter.

Caution: PCB Board Profile layers should always be placed at the bottom of the layer stack, and you should always have a PCB Board Profile layer in your printed circuit board layered image.
Tip: It is strongly recommended that board profiles are created with a 2-pixel (2 mils, or .002 inches) edge indication. Some CAM software cannot resolve a 1-mil board profile.

2-mil board profile detail

iToolBox's  File/New PCB  command automatically creates a 2-mil profile if you select  Full Board Profile so this is only a concern if you create your own profile layer, or modify the one that iToolBox created for you.

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 Solder Mask

PCB Board Profile layer
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