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2006.10.17 13:53 "Re: Tag 346", by Leonard Rosenthol
At 9:27 AM -0400 10/17/06, Ross Presser wrote: >The data are not quite equivalent; the colors do have semantic meaning >in this context -- it's important to know which pixels are magenta >rather than black, and the magenta and black pixels are not shades of >the same tint. It may work as an intermediate format. It would look >rather odd on screen, though, as a grayscale image, I didn't realize you were displaying on screen... I thought you were just needing to process it for some particular purpose (scaling, etc.). In which case, it didn't matter what the color values were. But yes, if you are actually planning to display it - and you know the colormap ahead of time - then sure, conversion of the indexed palette (ONLY) to RGB, performing the operations and then just replacing the palette back would be fine. Leonard -- --------------------------------------------------------------------------- Leonard Rosenthol <mailto:leonardr@pdfsages.com> Chief Technical Officer <http://www.pdfsages.com> PDF Sages, Inc. 215-938-7080 (voice) 215-689-3863 (fax)