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From: Rob van den Tillaart <rvdt@oce.nl>
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To: tiff@remotesensing.org
Subject: Re: [Tiff] Large TIFF files
References: <E1BDui3-0007qF-00@rom.localdomain> <407DEC23.2010300@pobox.com> <E1BDwRk-0007wz-00@rom.localdomain>
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Date: Thu, 15 Apr 2004 08:05:25 +0200
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Hi,

Are there people currently active to define a "64 bit tiff" proposal?
Is there a list of proposed alternatives?

regards,
Rob Tillaart


Lynn Quam wrote:
> 
> Frank Warmerdam replied:
> 
> >  Lynn Quam wrote:
> >  > What is the status of very large TIFF files.
> >  >
> >  > By very large I mean larger than 2^31 or 2^32 bytes.
> >  >
> >  > Is there any plan to support the POSIX off_t file offsets?
> >
> >  Lynn,
> >
> >  Files up to 4GB (2^32 bytes) work fine depending on how things are built.
> >  It should work well by default on modern Win32, Linux and Solaris systems
> >  for instance.  Offsets are managed as unsigned 32 bit integers.
> >
> >  There is relatively little point in any further changes unless a way of
> >  representing offsets of greater than 2^32 is added to the TIFF format.  There
> >  have been various discussions, but no concrete effortto move on the >4GB
> >  issue.
> 
> With the AMD-64 and Intel 64-bit clone of it, we are on the verge of a
> transition to inexpensive 64-bit computer systems.  TIFF needs to
> evolve in preparation for 64-bit systems.  The file format probably
> needs a extension for large files with 64 bit offsets, and it would be
> nice if these files could be read on 32-bit systems.
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