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December 2005
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2005.12.12 22:57 "Re: Writing EXIF data?", by Paul J Lucas
> Recently, support was added in libtiff (in 3.7.3) to support tags in EXIF > IFDs. I'm using 3.7.4. > Presumably it it is possible to create an EXIF IFD from scratch, or update an > existing EXIF IFD, if you know what you are doing. Yes, I'm creating one from scratch. > Previous versions which supported TIFFTAG_EXIFIFD are very limited (as you > describe), and older versions don't know anything about EXIF at all. So > everything depends on what version of libtiff you are using. OK, but, for 3.7.4, it's still not clear how you set the EXIF IFD to <binary chunk of data> --OR-- to use TIFFSetField() with EXIF tags. The 3.7.4 headers do *not* include EXIF tags, e.g, EXIF_APERTURE_VALUE (9202.H). - Paul