Name
InvertAlphaChannel -- invert alpha channel of a brush (V2.0)
Synopsis
InvertAlphaChannel(id)
Function
This function inverts the alpha channel of the brush specified by id. This means that the transparency for each pixel is turned around. If a pixel was previously 80% transparent, it will only be 20% transparent after an inversion and pixels who were 20% transparent will become 80% transparent after the inversion.

Inputs
id
brush whose alpha channel is to be inverted
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