LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
August 2004
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
2004.08.20 08:56 "Re: Tiff conversion using libtiff", by Joris Van Damme
Ross, > Here is a section of the code in the tiff2pdf.c file that checks when > the PhotometricIntepretation field is RGB that the number of samples is > 3, for Red, Green, and Blue: Presumably, PhotometricInterpretation = RGB and SamplesPerPixel = 1 could even be a valid combination, if and only if the Indexed tag is also present. See http://partners.adobe.com/asn/developer/pdfs/tn/TIFFPM6.pdf#page=11 or http://www.awaresystems.be/imaging/tiff/tifftags/indexed.html I must admit I have never seen such 'Indexed' image in the wild, so I'm looking forward to a tiffinfo or whatever tag dump. Note that it might not be a good idea to fool LibTiff into thinking PhotometricInterpretation = Palette without checking for presence of Indexed first. > Hey I've been developing Yet Another TIFF Tag Viewer Cheers! > I've > noticed that on Joris' web page there are still yet a few private tags > that I did not know of, see > http://www.awaresystems.be/imaging/tiff/tifftags.html . Likewise, your list contains a lot that I didn't yet have any data on. And thanks for the pointer. Indeed, since yesterday, a 'TIFF Tag Reference' is on-line. Anyone with remarks, thoughts, wishes, or willing to submit specifications on private tags, should contact me at joris.at.lebbeke@skynet.be. Have a nice day, Joris Van Damme info@awaresystems.be http://www.awaresystems.be Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html