2005.12.12 22:19 "[Tiff] Writing EXIF data?", by Paul J. Lucas

2005.12.12 22:57 "Re: [Tiff] 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