Re: Creating a color image with NSBitmapImageRep and greyscale data
Re: Creating a color image with NSBitmapImageRep and greyscale data
- Subject: Re: Creating a color image with NSBitmapImageRep and greyscale data
- From: David Spooner <email@hidden>
- Date: Tue, 27 Nov 2007 21:53:21 -0700
Yes, the documentation for the CIColorMap filter is somewhat vague.
There is a posting on the quartz-dev list which points to an example
usage in the Core Imager Fun House application and states that the
gradient image (2nd argument) is a 1xN lookup table mapping greyscale
values (appropriately scaled?) to rgb values...
dave
On 27-Nov-07, at 9:37 PM, Jason Horn wrote:
Dave,
Actually, there was a bug in my code. That loop should have been:
for (pixel=0; pixel<numPixels; pixel++) {
RGBData[RGBpixel] = pixels[pixel];
RGBData[RGBpixel+1] = pixels[pixel];
RGBData[RGBpixel+2] = pixels[pixel];
RGBpixel += 3;
}
So, now I have a color image (that is grey), but CIColorMap still
does not produce a color image. Perhaps I don't understand how
CIColorMap works.
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