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November 2003
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2003.11.17 14:23 "TIFF, v3.6.0. Fetching "custom" tags", by Frank Warmerdam
Chris Losinger wrote: > > i'm trying to read data in tag 34665 (EXIF data). In 3.5.7, i > used the tags/xtiff extension to read this non-core tag, and it worked > fine. > > But, since the v3.6.0.html page states: > > "Custom tags can be set and fetched normally using TIFFSetField() and > TIFFGetField(), and appear pretty much like normal tags to application > code. " > > I assume I can get rid of the tags/xtiff stuff and LibTiff will > happily read and store any tags that it finds, even non-core tags, like > 34665. > > But, it doesn't seem to be working. When reading the TIFF dir, i > get warnings about "unknown field with tag 34665 (0x8769) encountered", > and when i call TIFFGetField, nothing is returned. It looks like v3.6.0. > is behaving pretty much exactly like 3.5.7: complain about strange tags, > then ignore them. But that's not what the documentation says is supposed > to happen. > > confused. Chris, Could you provide a pointer to a file with this tag I could experiment with? Thanks, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent