Masked Image Searches #24
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Added support for using image masks to control which pixels on the needle image are searched for.
New parameters:
maskImage - Image name or object of the image to use as a mask. Must be equal to or larger than needleImage. May be the same as needleImage.
maskChannel - Index (0 through 3) of the color channel to use from the mask image. If no maskImage is specified, specifying a maskChannel will cause the needleImage to be used as the maskImage. So to search for just the visible portions of an RGBA image, set maskChannel=3.
@asweigart This is actually my first attempted contribution to an open source project so let me know if there is anything I'm missing.