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January 2007

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2007.01.31 10:53 "Interpreting SubIFDs tag", by <mikk@go2.pl>

2007.01.31 17:23 "Re: Interpreting SubIFDs tag", by Joris Van Damme

2007.02.01 09:42 "Re: Interpreting SubIFDs tag", by Gerben Vos

2007.02.01 18:32 "Re: Interpreting SubIFDs tag", by Joris Van Damme

2007.01.31 18:06 "Re: Interpreting SubIFDs tag", by Phil Harvey

2007.01.31 19:24 "Re: Interpreting SubIFDs tag", by Phil Harvey

2007.01.31 19:54 "Re: Interpreting SubIFDs tag", by Joris Van Damme

2007.01.31 22:24 "Re: Interpreting SubIFDs tag", by Ed Grissom

2007.02.01 18:17 "Re: Interpreting SubIFDs tag", by Phil Harvey

2007.02.01 18:34 "Re: Interpreting SubIFDs tag", by Joris Van Damme

2007.02.01 18:48 "Re: Interpreting SubIFDs tag", by Phil Harvey

2007.02.01 19:00 "Re: Interpreting SubIFDs tag", by Joris Van Damme

2007.02.01 19:36 "Re: Interpreting SubIFDs tag", by Phil Harvey

2007.02.01 20:02 "Re: Interpreting SubIFDs tag", by Joris Van Damme

2007.02.01 23:14 "Re: get tifftag_geoasciiparams string", by Phil Harvey

2007.02.02 00:07 "Re: get tifftag_geoasciiparams string", by Phil Harvey

2007.02.01 15:46 "Re: Interpreting SubIFDs tag", by Phil Harvey

2007.02.01 09:42 "Re: Interpreting SubIFDs tag", by Gerben Vos

Joris wrote:

> In fact, sometimes both are 
> combined, and I've come accross files where the same second and third
> SubIFD gets pointed to in both ways.

It sounds like a bad idea to write such TIFFs. It's good that you have some
reading code which deals with this in a smart way, but TIFF writers
shouldn't expect readers in general to handle this. A TIFF copying program
will typically duplicate the IFDs and image data that are pointed to
multiple times, and this can grow rather fast as the number of paths to an
IFD increases.

					Gerben Vos.