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January 2007
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2007.02.01 09:56 "Re: 16bit grayscale with colormap", by Reinhard Mayr Aka Czerwinski
Philip, thank you for your precious hint -- that was the problem. SHORT is 2 bytes, not 1! I managed to create a 16bit grayscale TIFF with a colormap. ImageMagick displays the file (although the colors seem to be weired). ImageJ ignores the colormap. Microsoft Tools reject the file. It seems as if this is a border-line interpretation of the specs and, therefore, questionable whether a solution like that would make sense at all. As far as I am concerned, I think of refraining from 16bit+colormap and try to implement like ImageJ does: info about brightness/contrast in a TIFF-Tag (0x0270 ImageDescription, as a text), and doing all the palette stuff for rendering by my own... :-/ Thank you all for your help! Cz. -------- Original-Nachricht -------- Datum: Wed, 31 Jan 2007 14:06:22 -0500 Von: Phillip Crews <pcrews@cerious.com> An: tiff@lists.maptools.org CC: Betreff: Re: [Tiff] 16bit grayscale with colormap > Your color map is not the right length. The color map for a 16-bpp image > should be 393216 bytes (196608 words). > > - Phillip > > Reinhard Mayr aka Czerwinski wrote: > > Hmmm ... I go the same message with ImageMagick's imdisplay.exe. Maybe > the error message is just a bit too un-exact: the color map is there > (according to the dump), maybe it's just about the unexpected length of > 192kB > instead of 256 byte? The values of the dump represent exactly what I have > in > the color map (repeated ASCII "0123456789ABCDEF"). > > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/ -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer