Converting NSImage with multiple image representations (HiDPI+LowDPI) into grayscale NSImage
Converting NSImage with multiple image representations (HiDPI+LowDPI) into grayscale NSImage
- Subject: Converting NSImage with multiple image representations (HiDPI+LowDPI) into grayscale NSImage
- From: Abhijit Apte <email@hidden>
- Date: Mon, 10 Sep 2012 13:01:52 +0530
Hi,
I have been running into a problem wherein I need to grayscale all the
NSImageRep objects within a NSImage (i.e. say NSImage contains two
representations for testimg.png and email@hidden).
CGImageRef which has a one-to-one correspondence with one image
representation. With CGImageRef, the conversion to grayscale is
straight-forward.
I can pick out NSImageRep objects of NSImage and then use [NSImageRep
CGImageForProposedRect:context:hints:] method to extract CGImageRef. I can
do grayscale conversion on each of these CGImageRefs, however I cannot put
these back into a single NSImage.
Is there a way to do this without converting to CGImageRef? How do we
handle multiple representations when applying grayscale?
Regards
-Abhijit
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