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16 bit integer per colour bitmap graphics context

Subject: 16 bit integer per colour bitmap graphics context
From: Martin Greenwood <email@hidden>
Date: Thu, 12 May 2005 22:07:42 +0100
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This article suggests that 16bit per colour (b48r or b64a) images are supported by Quartz 2D.

http://developer.apple.com/qa/qa2001/qa1114.html

Whereas Table 2.1 here suggests that 8bit is the largest size for a colour.

http://developer.apple.com/documentation/GraphicsImaging/Conceptual/ drawingwithquartz2d/dq_context/chapter_3_section_4.html

When I try to create a bitmap graphics context the following happens..

CGBitmapContextCreate: unsupported parameter combination: 16 integer bits/component; 48 bits/pixel; 3-component colorspace; kCGImageAlphaNone. or CGBitmapContextCreate: unsupported parameter combination: 16 integer bits/component; 64 bits/pixel; 3-component colorspace; kCGImageAlphaPremultipliedLast.

Can I use Quartz to draw into b48r or b64a bitmaps?

Thanks

Martin

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