LibTiff Mailing List
TIFF and LibTiff Mailing List Archive
January 2011
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
2011.01.05 22:17 "Re: Cannot add EXIF tag to image being written (non-EXIF tags are being added)", by Andreas Kleinert
Hi, there is no direct support for EXIF tags in libtiff - instead they are kept in a private IFD (TIFFTAG_EXIFIFD) which has to be handled by your custom code. You possibly might want to use a dedicated exif library instead, like libexif or exifv2. Best Regards, Andreas, author of SView5 -------- Original Message -------- Subject: [Tiff] Cannot add EXIF tag to image being written (non-EXIF tags are being added) From: <peter.bauer@datamine.ca> To: tiff@lists.maptools.org Date: 05.01.2011 22:38 > Hello, > > > > One more try. I’m using v3.9.4 of libtiff and cannot add EXIF tag(s) > to the image being written. ImageWriteTiff is the main call. Everything > works as expected except that the tag EXIFTAG_FOCALLENGTH is not being > added to the image. No error occurs. > > > > I just started using libtiff for adding tags a few days ago and am not > sure if I’m missing something that should be obvious (with experience > with the lib) or if I hit a bug. > > > > // Works > > result = TIFFSetField(tiff, TIFFTAG_SUBFILETYPE, (USHORT) 0); > > ASSERT(result); > > // Works > > result = TIFFSetField(tiff, TIFFTAG_MAKE, "Allied"); > > ASSERT(result); > > // Works > > result = TIFFSetField(tiff, TIFFTAG_MODEL, "GC2450C"); > > ASSERT(result); > > > > // Does not work – no error no tag value added to TIFF image when > written – other tags added above are added > > result = TIFFSetField(tiff, EXIFTAG_FOCALLENGTH, (float) 12.5F); > > ASSERT(result); > > > > Regards, > > > > Peter