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Re: CGBitmapContextCreate hates me

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Re: CGBitmapContextCreate hates me

Subject: Re: CGBitmapContextCreate hates me
From: Scott Thompson <email@hidden>
Date: Mon, 20 Mar 2006 15:23:36 -0600


On Mar 20, 2006, at 3:17 PM, Scott Thompson wrote:

Core Graphics doesn't support RGB Bitmap contexts (i.e. ones with no storage for alpha channel). Set your components to 4 and use kCGImageAlphaNoneSkipFirst or kCGImageAlphaNoneSkipLast. (depending on your desires).
see also:
<http://developer.apple.com/qa/qa2001/qa1037.html>
Scott

P.S. Core Graphics can handle some pixel formats in images that it doesn't support for CGBitmapContexts. For example, you can create a CGImage which from RGB (with no alpha) data and make use of it even though you can't create a CGBitmapContext with that pixel format.

Scott

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References:  
  >CGBitmapContextCreate hates me (From: Jim Turner <email@hidden>)
  >Re: CGBitmapContextCreate hates me (From: Scott Thompson <email@hidden>)




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