On Tue, 15 Aug 2017 10:07:47 -0700, Doug Hill said:

>>> Check out CoreImage ColorControls filter, which has a Saturation parameter:
>> 
>> Thanks Doug and Jonathan for the CIImage suggestion, I'll take a
>closer look.  But one thing I don't see at all in CIImage.h is how to
>get an NSData of the pixels of a CIImage.  There are init methods that
>take NSData, but nothing I see gives NSData.
>> 
>> I should note that I have no need to draw this data whatsoever.  I
>only need access to the raw pixels to do some custom processing on.
>
>NSBitmapImageRep can be created from a CIImage, and has methods for
>creating an NSData version of the bitmap, or just getting the bitmapData
>and/or data planes.

Right, but then I'm back where I started. :(  Because there's (apparently) no 
way to ensure that the NSBitmapImageRep I get is in a particular format, and I 
absolutely need 8 bit per pixel & greyscale.

Cheers,

-- 
____________________________________________________________
Sean McBride, B. Eng                 s...@rogue-research.com
Rogue Research                        www.rogue-research.com 
Mac Software Developer              Montréal, Québec, Canada


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