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Date: Mon, 12 Dec 2005 14:57:11 -0800 (PST)
From: "Paul J. Lucas" <pauljlucas@mac.com>
To: tiff@lists.maptools.org
Subject: Re: [Tiff] Writing EXIF data?
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Status:   

On Mon, 12 Dec 2005, Bob Friesenhahn wrote:

> 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
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