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| Function: | im.Alpha | (image, alpha, **properties): |
Returns an alpha-mapped version of the image. Alpha is the maximum alpha that this image can have, a number between 0.0 (fully transparent) and 1.0 (opaque).
If an image already has an alpha channel, values in that alpha channel are reduced as appropriate.
init: image cyan alpha = im.Alpha("cyan.png", 0.5)