2012.02.01 22:29 "Re: [Tiff] tiff warning question", by Bob Friesenhahn

On Wed, 1 Feb 2012, ikoelliker@daegis.com wrote:

We are using tesserat (which includes libtiff) to OCR tiff files. For certain files I am seeing warnings such as:

TIFFReadDirectory: Warning, TIFFstream: invalid TIFF directory; tags are not sorted in ascending order.

TIFFReadDirectory: Warning, TIFFstream: unknown field with tag 32934 (0x80a6) encountered.

The file is still processed fine, but my question is will this cause processing to take longer or produce less accurate information?

The answer to this is "it depends". There are TIFF-based formats which can't be correctly (or fully) deciphered without using private tags. However, it seems unlikely that you would encounter such files.

Bob
--
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/