LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
August 2005
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
2005.08.04 15:10 "Re: tiff unknown field of tag", by Bob Friesenhahn
On Thu, 4 Aug 2005, Steven Woody wrote: > > i got back some scaned tiff's from a photo lab. openning with xv or gimp > just got a warning message: unkown field of tag 34665(0x8769). i want to know > what's wrong with thoese files and how do a work around. The warning does not mean there is something "wrong" with the file, it just means that there is a tag in the file that libtiff does not support. Usually this is benign. > 1. what means "ICC Profile: <present>" ? and what is ICC ? ICC is the International Color Consortium (http://www.color.org/) and an ICC profile is a type of reference "lookup table" which ensures accurate color as long as the using software also properly support ICC profiles. It allows you to do things like print your photo to a printer (which also has an ICC profile) and obtain accurate color. > 2. i noticed this file is uncompressed. so what's the benefit the lab save > result in tiff rather than a bmp? While the latest BMP version supports attaching ICC profiles, many software packages will simply fail to load the BMP entirely. TIFF is seen as a format used by "professionals" and is well supported by desktop publishing software. As far as the actual image goes, a 24-bit BMP is just as good as a 24-bit TIFF. Bob ====================================== Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/