I want to create a 1-bit mask from an image file. I can create a
CGImageRef from the file, but then what? CGImageMaskCreate wants
the bitmap in memory, but apparently CGBitmapContextCreate cannot
create a 1 bit per component bitmap context.
Create an 8 bit per component grayscale bitmap context and draw the
image into that. Then create the mask from the grayscale image data.
Scott
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