Lingo Dictionary > D-F > extractAlpha() |
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extractAlpha()
Syntax
imageObject
.extractAlpha()
Description
This function copies the alpha channel from the given 32-bit image and returns it as a new image object. The result is an 8-bit grayscale image representing the alpha channel.
This function is useful for downsampling 32-bit images with alpha channels.
Example
This statement places the alpha channel of the image of member 1 into the variable mainAlpha
.
mainAlpha = member(1).image.extractAlpha()
setAlpha, useAlpha
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