im.AlphaMask - Ren'Py Visual Novel Engine

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# im.AlphaMask

Function: | im.AlphaMask | (base, mask, **properties):

base and mask should be image manipulators. This function takes the red channel from mask, and applies it to the alpha channel of base to create a new image.

## Example

    init:
        image eileen happy  = im.AlphaMask("eileen_happy.base.jpg", "eileen_happy.mask.jpg")

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