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From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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Cc: tiff@lists.maptools.org
Subject: Re: [Tiff] BigTiff support (libtiff 4.0.1 vs libtif f4.1)
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On Wed, 29 Feb 2012, Olivier Paquet wrote:

> On Wed, Feb 29, 2012 at 3:22 AM, Cip Cipper <cipper82@gmail.com> wrote:
>> Adobe will offer support for BigTiff, or maybe a future libTiff version will
>> behave like I have described and automatically update a file to BigTiff only
>> when it is necessary.
>
> For what it's worth, it's one of my long term wishes as well. I don' t
> know if I'll ever have time to implement it though.

I can't think of any reasonable way to implement this.  With a single 
image frame it may be possible to reliably estimate when BigTIFF is 
needed, but only if the image dimensions and properties are known in 
advance.  With multiple image frames written over time, it seems 
impossible.

People dealing with 4GB+ files are well aware of the file 
sizes.  Such large files take considerable time to read and write, and 
require lots of storage.  Since consideration is required before 
deciding to write a 4GB+ file, part of that consideration can be if 
BigTIFF is needed.

Users of libtiff 4.X should not be alarmed if a BigTIFF file is 
encountered since it will just plain work.  Adobe has been paying 
attention to BigTIFF all along and we can hope that eventually Adobe 
software will support BigTIFF.

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