On May 14, 2005, at 11:15 PM, R. Scott Thompson wrote:
I have a grayscale JPEG (a lovely, blurry circle) and I want to use
that as an Image Mask. Can load the file's pixel data into a
CGImage, through ImageIO, but that creates an Image (i.e. a CGImage
with a color space) and not an image mask (which I gather is a
CGImage with no color space).
What I don't know is what is the best way to convert the Image into
an Image Mask.
The most obvious way to do what I want, I believe, is going to be
to create a grayscale bitmap context, draw the image I want to use
as my mask into that bitmap, then use CGCreateImageMask to create a
mask from the pixels. That seems like a very round-about way to
create a mask from an image.
FWIW, that's what I do. It's not particularly inefficient since you
have to allocate the mask's backing store at some point anyway.
Nick
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