/ Layer Blending Modes
/ PCB Blend Modes
§ 126.96.36.199 - 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.
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
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.
Because the Gerber
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
PCB Board Profile layer
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