Name
BrushToGray -- convert brush to gray (V1.5)
Synopsis
BrushToGray(id)
Function
This function converts the brush specified by id to gray. If the brush is big, this can take some time.

Note that if id specifies a palette brush, BrushToGray() will just convert the palette colors to gray which makes this function really fast when used with palette brushes.

Inputs
id
identifier of the brush to convert
Example
BrushToGray(1)
Convert brush 1 to gray.
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