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September 2004
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2004.09.02 15:22 "Re: 16bit compressed colormaps", by Bob Friesenhahn
On Thu, 2 Sep 2004, Frank Warmerdam wrote: > > Are 16bit images with colormaps actually common? I have never supported them > in my software and haven't encountered any in my various projects. Who has > run into them? Is this an area we should be worried about handling > efficiently? I do know that ImageMagick & GraphicsMagick can support colormaps up to 64K entries. Certainly GraphicsMagick can read and write TIFF files with large colormaps (just verified that). I don't recall encountering a TIFF file with a large colormap in the wild. Other than limitations with existing/legacy software, it seems reasonable for TIFF software to use large colormaps if it benefits the needs of the application. Certain algorithms benefit significantly from colormaps. If an application uses colormaps with 4096 entries (rather than a puny 256), is that so bad? Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us http://www.simplesystems.org/users/bfriesen