2009.07.07 00:38 "[Tiff] tiffcrop using incorrect units", by Kevin Myers

2009.07.07 17:39 "Re: [Tiff] Tiff Digest, Vol 62, Issue 5", by Richard Nolde

   The version of tiffcrop that was distributed with libtiff-3.8.2 is
very old indeed. If you type tiffcrop -v, the current release should show:
 tiffcrop -v

Tiffcrop version: 2.0, last updated: 02-12-2009.

Tiffcp code: Copyright (c) 1988-1997 Sam Leffler.

           : Copyright (c) 1991-1997 Silicon Graphics, Inc.

Tiffcrop additions: Copyright (c) 2007-2009 Richard Nolde.

Please download the current code from CVS for 3.9 or 4.0 if you need BIGTIFF support. I don't have a build of the old release around any more, but I am fairly certain that your command line should work unless there are issues with the original TIFF files. I had to put a patch into the original code that handled the case where no resolution unit is specified and may be the issue. If you send me the results of running tiffinfo on the file it might help.

   If you cannot download the current source from CVS, please let me

know and I can send it to your directly. I don't have a Windows build of libtiff as I work on Linux and AIX, but I could try to cross compile a tiffcrop executable at some point. Lacking any access to or need for Microsoft tools, I doubt that it would match the distributed version.

Richard Nolde

tiffcrop author

> Today's Topics:
> 1. tiffcrop using incorrect units (Kevin Myers)
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> Date: Mon, 6 Jul 2009 19:38:47 -0500
> From: "Kevin Myers" <kmyers1@clearwire.net>
> Subject: [Tiff] tiffcrop using incorrect units
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I am attempting to use the tiffcrop utility to crop some extremely large images (multi-hundred megapixel) so that I can process the resulting smaller images in an OCR application. Unfortunately, tiffcrop seems to be ignoring or misinterpreting the pixel units that I have specified using the -U option. Here is the command that I used:

tiffcrop -i -E top -U px -X 2400 -Y 4800 oldfile.tif newfile.tif

I am using libtiff version 3.8.2 under Windows XP. Based on results with different -X and -Y values, it appears that tiffcrop is interpreting the values as inches rather than pixels.

Am I doing something wrong?

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