graphicsmagick won't "gm identify" resolution correctly

Hi!

I have some tif-files on which "gm identify [-verbose]" shows a resolution of 
0, 0 pixels/inch. Quite possibly that is only with files that have been 
created with a certain version of Kodak's DCS PhotoDesk. Photoshop shows a 
resolution of 72dpi on those images.

The example.tif can be downloaded at 
http://politbuero.dyndns.org/example.tif.bz2. Sorry, the file is 11mb in 
size, I had no smaller file showing this problem, and when I open and save it 
it photoshop, the problem is gone. Can an image have a resolution of 0 dpi? 
Is there any way to fix this, other than opening and saving all those files 
in photoshop?

thanks!
Ben Adler

P.S: Please CC me if possible, I'm not subscribed.

gm identify -verbose example.tif[0]
TIFF Directory at offset 0x8
  Subfile Type: (0 = 0x0)
  Image Width: 3032 Image Length: 2008
  Resolution: 0, 0 pixels/inch
  Bits/Sample: 8
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Software: "KODAK PROFESSIONAL DCS Photo Desk TIFF Export v1.1"
  Image Description: ""
  Make: "Kodak"
  Samples/Pixel: 3
  Rows/Strip: 1
  Planar Configuration: single image plane
  ICC Profile: <present>, 3144 bytes
  RichTIFFIPTC Data: <present>, 1024 bytes
Image: example.tif
  Format: TIFF (Tagged Image File Format)
  Geometry: 3032x2008
  Class: DirectClass
  Type: true color
  Depth: 8 bits-per-pixel component
  Channel Depths:
    Red:      8 bits
    Green:    8 bits
    Blue:     8 bits
  Channel Statistics:
    Red:
      Minimum:                     0
      Maximum:                   255
      Mean:                       80.5265
      Standard Deviation:         53.8055
    Green:
      Minimum:                     0
      Maximum:                   255
      Mean:                       83.1849
      Standard Deviation:         54.6367
    Blue:
      Minimum:                     0
      Maximum:                   255
      Mean:                       61.5153
      Standard Deviation:         48.3747
  Colors: 404474
  Filesize: 17.5m
  Interlace: None
  Background Color: grey100
  Border Color: #DFDFDF
  Matte Color: grey74
  Dispose: Undefined
  Iterations: 0
  Compression: None
  Software: KODAK PROFESSIONAL DCS Photo Desk TIFF Export v1.1
  Make: Kodak
  Signature: acc8e47ff46399476311aeee3f1ffa152e1f4f3a402bc62630e4e395cf2d2030
  Profile-color: 3144 bytes
  Tainted: False
  User Time: 0.210u
  Elapsed Time: 0:01
gm identify: unknown field with tag 34665 (0x8769) ignored. (example.tif).


gm -version
Version: GraphicsMagick 1.1.2 2004-06-06 Q8 http://www.GraphicsMagick.org/
Copyright: Copyright (C) 2002, 2003, 2004 GraphicsMagick Group. Additional 
copyrights and licenses apply to this software, see 
http://www.GraphicsMagick.org/www/Copyright.html
Host type: i686-pc-linux-gnu

Configured using the command:
  ./configure '--prefix=/usr' '--host=i686-pc-linux-gnu' 
'--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' 
'--sysconfdir=/etc' '--localstatedir=/var/lib' '--enable-shared' 
'--with-quantum-depth=8' '--with-threads' '--with-bzlib' '--without-perl' 
'--enable-lzw' 'CC=gcc' 'CFLAGS=-march=pentium3 -O3 -pipe' 'CXXFLAGS=-O2 
-mcpu=i686 -pipe' 'CXX=g++' 'host_alias=i686-pc-linux-gnu' 
--enable-ltdl-convenience

Final Build Parameters:
  CC       = gcc
  CFLAGS   = -march=pentium3 -O3 -pipe -Wall -pthread
  CPPFLAGS = -I/usr/include/freetype2 -I/usr/X11R6/include 
-I/usr/X11R6/include/X11 -I/usr/include/libxml2
  CXX      = g++
  CXXFLAGS = -O2 -mcpu=i686 -pipe -pthread
  LDFLAGS  = -L/usr/X11R6/lib -L/usr/lib -L/usr/lib
  LIBS     = -ljbig -llcms -ltiff -lfreetype -ljasper -ljpeg -lpng -lwmflite 
-ldpstk -ldps -lXt -lXext -lSM -lICE -lX11 -lbz2 -lxml2 -lz -lm -lpthread


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