LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
January 2007
Previous Thread
Next Thread
Previous by Thread
Next by Thread
Previous by Date
Next by Date
Contact
The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems
Thread
2007.01.31 17:53 "Re: 16bit grayscale with colormap", by Bob Friesenhahn
On Wed, 31 Jan 2007, Reinhard Mayr aka Czerwinski wrote: > Bob, > > thanks for that quick response! Attached there is the mentioned sample > file I created with a hex editor. (The colormap contains just crap data > but should be enough for a proof of concept.) The opening behavior of some > programs was described in my initial post. > > How can you display the file? No, I can not. In fact libtiff's tiffinfo does not like the file either (libtiff fails to locate the colormap) so it seems that the file is not formulated correctly: % tiffinfo CytoScout16bitImageJ-0106_3-v5.tif CytoScout16bitImageJ-0106_3-v5.tif: Error fetching data for field "ColorMap". MissingRequired: CytoScout16bitImageJ-0106_3-v5.tif: TIFF directory is missing required "Colormap" field. % tiffdump CytoScout16bitImageJ-0106_3-v5.tif CytoScout16bitImageJ-0106_3-v5.tif: Magic: 0x4d4d <big-endian> Version: 0x2a Directory 0: offset 8 (0x8) next 0 (0) SubFileType (254) LONG (4) 1<0> ImageWidth (256) SHORT (3) 1<200> ImageLength (257) SHORT (3) 1<200> BitsPerSample (258) SHORT (3) 1<16> Photometric (262) SHORT (3) 1<3> ImageDescription (270) ASCII (2) 34<ImageJ=1.37v\nmin=57.0\nma ...> StripOffsets (273) LONG (4) 1<768> SamplesPerPixel (277) SHORT (3) 1<1> RowsPerStrip (278) SHORT (3) 1<200> StripByteCounts (279) LONG (4) 1<80000> Colormap (320) SHORT (3) 196608<12337 12851 13365 13879 14393 16706 17220 17734 12337 12851 13365 13879 14393 16706 17220 17734 12337 12851 13365 13879 14393 16706 17220 17734 ...> The error reported by libtiff when used by GraphicsMagick is that it fails to retrieve the colormap: Error fetching data for field "ColorMap". Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/