[magick-users] IM corrupting TIFF files when using -compress option?

[Steven Cogorno]

Hi,

I am trying to use the -compress option with convert to produce smaller
TIFF files.  This is the command that I am using:

convert -units PixelsPerInch -density "100x100" -depth 8
-background white -flatten +matte -compress lzw  INPUTFILE
tiff:OUTPUTFILE

If I don't use the compress option, the graphics convert fine (but
they're huge).  If I add the -compress lzw, ImageMagick appears to
compress the file.  Here's an example:

-rwxr-xr-x   1 cogorno  staff      33940 Jun  6 18:28 compressed.tiff
-rwxr-xr-x   1 cogorno  staff     225214 Jun  5 13:30 uncompressed.tiff

But, the compressed.tiff file is corrupt.  The tiffinfo command reports:
   compressed.tiff: Not a TIFF file, bad magic number 32821 (0x8035).

And, the Solaris file command reports:
   compressed.tiff:        8086 relocatable (Microsoft)

I've installed the latest version of ImageMagick. (I downloaded the
Solaris 10 version -- I did not build this myself.)
   Version: ImageMagick 6.3.4 05/25/07 Q16 http://www.imagemagick.org
   Copyright: Copyright (C) 1999-2007 ImageMagick Studio LLC


I don't know what to try next.  Has anyone seen this before?

Thanks!

-Steve Cogorno


-- 
  Steven Cogorno
  cogorno at fastmail.fm