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Date: Tue, 9 Nov 93 13:59:58 -0700
From: Dr. Lorien Y. Pratt <lpratt@franklinite.Mines.Colorado.EDU>
Message-Id: <9311092059.AA04354@franklinite.Mines.Colorado.EDU>
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To: tiff@ucbvax.Berkeley.EDU
Subject: Problem with tiff files that were ftp'd across a file system
Sender: tiff-owner@sgi.sgi.com

Hello,
  We have a number of tiff files that seem to have been wrecked, and I'd like  
to avoid having to re-image them.  The diagnostics are as follows:
  ------------------------------------------------------------------
choma% tiffdump hair-20-2-5.tiff
hair-20-2-5.tiff:
Magic: 0x4d4d <big-endian> Version: 0x2a
Directory 0: offset 557984 (0x883a0)

Directory 1: offset 16842755 (0x1010003)
hair-20-2-5.tiff: Error while reading directory count.

choma% tiffinfo hair-20-2-5.tiff
hair-20-2-5.tiff: TIFF directory is missing required "ImageLength" field.
choma% 

  ---------------------------------------------------------------------
The process that created these munged files, as far as I can tell, is:
  

  The NeXT application``grab'' created them.
  They were ftp'd from the next to the SGI
  They were ftp'd back to the next
  We received an error in our image previewer
  They were ftp'd to a sun with the tiffdump and tiffinfo programs for 

    analysis.

Any suggestions as to what went wrong?
  --Lori



