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TIFF and LibTiff Mail List Archive

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2003.11.17 00:45 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Chris Losinger
2003.11.17 14:23 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Frank Warmerdam
2003.11.17 15:16 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Andrey Kiselev
2003.11.17 16:07 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Frank Warmerdam
2003.11.17 16:26 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Andrey Kiselev
2003.11.18 02:13 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Ross Finlayson
2003.11.18 06:59 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Ross Finlayson
2003.12.26 11:51 "Re: [Tiff] writing custom tags with TIFFSetField", by Andrey Kiselev
2003.12.26 19:17 "Re: [Tiff] CopyTag error again...", by Andrey Kiselev
2003.12.26 18:48 "[Tiff] CopyTag error again...", by Carl J. Collin
2003.11.18 15:05 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Finlayson, Ross
2003.11.18 23:08 "[Tiff] TIFF Q about pseudo-tags for Pixar", by Chris Losinger
2003.11.19 02:20 "[Tiff] TIFF Q about pseudo-tags for Pixar", by Frank Warmerdam

2003.11.17 00:45 "[Tiff] TIFF, v3.6.0. Fetching "custom" tags", by Chris Losinger

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.

         -c

----
Chris Losinger
losinger@earthlink.net

smallest@smalleranimals.com http://www.smalleranimals.com