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Re: image file as 1-bit mask

Scott Thompson wrote: 

On Mar 20, 2008, at 2:03 PM, James Walker wrote:

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.

In other words, I can't make a 1-bit mask, but I don't really need to. That does seem to work. Thanks.
--
James W. Walker, Innoventive Software LLC
<http://www.frameforge3d.com/>
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References: 
 >image file as 1-bit mask (From: James Walker <email@hidden>)
 >Re: image file as 1-bit mask (From: Scott Thompson <email@hidden>)



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