LibTiff Mailing List

TIFF and LibTiff Mailing List Archive
November 2005

Previous Thread
Next Thread

Previous by Thread
Next by Thread

Previous by Date
Next by Date

The TIFF Mailing List Homepage
This list is run by Frank Warmerdam
Archive maintained by AWare Systems

2005.11.22 15:22 "Geotifcp for decompression?", by Alex Brown

Hello - I'm processing a large timeseries collection from
http://glcf.umiacs.umd.edu/data/gimms;  I find the data is in a 16b
integer "compressed greyscale" GeoTIFF format that's not supported by
Idrisi, our preferred toolkit here at Clark U.   I am trying to find a
scriptable solution to decompression, and although it looks like
geotifcp should be able to do it (based on tiffcp(1) support of LZW etc
through -c switch), geotifcp can't read the header, and tiffinfo finds 
unknown tags (below).

As a file integrity check I read it with "irfanview" and saved with no
compression;  the resulting file did import to Idrisi as two 8b band
images, which look like they might be high and low order bytes.  I
really need the 16b data unfortunately, and I would like to find a clean
way to use geotifcp to process hundreds of 40MB files rather than
irfanview's batch feature.  Any suggestions?

Thanks in advance -

-- 
Alex Brown <albrown@clarku.edu>
http://black.clarku.edu/~abrown2
+1 508 421 3712 lab
+1 617 308 9456 mobile


bash-2.05b$ tiffinfo  81aug15a.n07-VIg_data.tif > 
81aug15a.n07-VIg_data_tif_info.txt
TIFFReadDirectory: Warning, 81aug15a.n07-VIg_data.tif: unknown field 
with tag 33550 (0x830e) encountered.
TIFFReadDirectory: Warning, 81aug15a.n07-VIg_data.tif: unknown field 
with tag 33922 (0x8482) encountered.
TIFFReadDirectory: Warning, 81aug15a.n07-VIg_data.tif:  with tag 34735 
(0x87af) encountered.
bash-2.05b$