Does CGImage support 16 bits per channel?

Question

bitsPerComponent says it's at most 8, but a couple of Stack Overflow questions imply 16 is supported.

score 0 · Answer 1 · answered Apr 12 '19 at 09:14

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It seems that the official documentation is wrong

https://www.websupergoo.com/helppdfnet/default.htm?page=source%2F6-abcpdf.objects%2Fpixmap%2F2-properties%2Fbitspercomponent.htm Helps to confirm this

answered Apr 12 '19 at 09:14

AleksW

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The question is about iOS, and the answer is about PDF in .NET :) – Kartick Vaddadi Apr 14 '19 at 08:58

score 0 · Answer 2 · answered Apr 19 '19 at 06:05

You can find the necessary information in “Supported Pixel Formats“ in the “Graphics Contexts“ chapter of “Quartz 2D Programming Guide“ below even it is archived documentation.

https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_context/dq_context.html

The below figure is taken from the above url.

Note that “bpp“ is specified as “bits per pixel“ and “bcp“ is “bits per component“. As given in above table, it seems that only Mac OS (>=10.X versions) supports 16 bcp, not iOS.

Does CGImage support 16 bits per channel?

2 Answers2