Re: Color matching of NSBitmapImageRep

Subject: Re: Color matching of NSBitmapImageRep
From: Marcel Weiher <email@hidden>
Date: Thu, 30 Aug 2007 07:20:36 -0700
Delivered-to: email@hidden
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On Aug 29, 2007, at 5:54 PM, Wim Lewis wrote:

- Convert the color to the calibrated RGB space by calling [foo colorUsingColorSpaceName:NSCalibratedRGBColorSpace]. - Create an NSBitmapImageRep in the NSCalibratedRGBColorSpace, 32- bit RGBA:

NSBitmapImageRep *foo = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:buffer pixelsWide:width pixelsHigh:height bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES isPlanar:NO colorSpaceName:NSCalibratedRGBColorSpace bytesPerRow:4 * width bitsPerPixel:32];


[snip detailed description, all of which seemed correct]

Does your image actually have alpha transparency? If yes, are you accounting for the fact that NSBitmapImageRep stores its samples pre- multiplied? (Or have we stopped doing that?)

Marcel

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References:  
  >Color matching of NSBitmapImageRep (From: Wim Lewis <email@hidden>)




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References:
	>Color matching of NSBitmapImageRep (From: Wim Lewis <email@hidden>)