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Re: Problem with converting an NSImage to grayscale

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Re: Problem with converting an NSImage to grayscale

Subject: Re: Problem with converting an NSImage to grayscale
From: Heinrich Giesen <email@hidden>
Date: Tue, 30 Aug 2005 17:00:58 +0200


On 30.08.2005, at 16:31, John C. Randolph wrote:

The Image Difference sample is correct, for versions of OS X prior to Tiger. The point I was making is that it's no longer necessary to do this at all, since CoreImage has a filter that does the RGB to grayscale mapping according to the NTSC formula.


I fully agree and I hope you do not feel offended by my remarks.
I did not know why Arik wanted to convert an RGB image. Did he need
a gray image or did he want to know more about dealing with pixels.
I only wanted to point to the often unknown problem of padding
bytes.

    Heinrich


--
Heinrich Giesen
email@hidden


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References:  
  >Re: Problem with converting an NSImage to grayscale (From: Heinrich Giesen <email@hidden>)
  >Re: Problem with converting an NSImage to grayscale (From: "John C. Randolph" <email@hidden>)




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