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From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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Cc: "tiff@lists.maptools.org" <tiff@lists.maptools.org>
Subject: Re: [Tiff] problems saving BigTIFF format
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On Wed, 30 Aug 2017, Paul Hemmer wrote:
>
> When I try to open it using gm convert <myfile>, after several seconds I see:
>
> gm convert: Corrupted LZW table at scanline 40704. (LZWDecode)
>
> So that gives me a clue at least! I'm entirely unsure how to proceed though.  I don't have any reason to believe my source data is corrupted.

What operating system are you using?  Is this something like Linux, or 
Microsoft Windows?

How did you build libtiff (e.g. what compiler, and what I/O source 
module 'win32' vs 'unix' was selected)?

Perhaps there is some problem with large file handling in the writer, 
or in the GraphicsMagick build.

BigTIFF still requires that the writer and the reader be able to 
access data beyond 4GB.  It is suspect that your file is claimed to be 
exactly 4.0Gi in size.

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