Posted: 2006-03-25T12:16:21-07:00
You can use MagickLib::GetNumberColors() to write the image histogram to a file or you can iterate over the image pixels and create the histogram yourself.
What would be nice is to be able to generate a color map file.
That is a image that contains one color pixel for each color that exists
in the image.
EG: convert logo: -colors 32 -colormap t.gif
will return an image that is 1x32 pixels in size at the most.
This minimal image can then be used for a -map argument.
and its size can be used as a final color count.