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Message-ID: <408CED3A.31E6D7B5@oce.nl>
From: Rob van den Tillaart <rvdt@oce.nl>
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To: Joris <joris.at.lebbeke@skynet.be>
CC: Tiff mailing list <tiff@remotesensing.org>
Subject: Re: [Tiff] Large TIFF files
References: <Pine.GSO.4.44.0404221641250.11901-100000@scooby.simplesystems.org> <p0521061cbcadf0a4cb7d@[153.32.48.223]> <001e01c428b9$962b7df0$837988d9@dfgrrxsknr4e> <p0521061dbcadf8729fcf@[153.32.48.223]> <40890FE4.7080302@informatix.co.uk> <000f01c42934$afb6d690$2a57f051@dfgrrxsknr4e> <408CBA8B.B98D90BB@oce.nl> <002301c42b75$0b14ff70$e1b588d9@dfgrrxsknr4e>
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Date: Mon, 26 Apr 2004 13:06:34 +0200
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Joris wrote:
> 
[some discussion deleted]

> > It is not possible to select allways in advance the right mode, as a
> > user can
> > decide to enlarge a bitmap to > 4GB. When 32 bit mode was chosen and
> > there is
> > a sudden runtime switch to 64bit mode I can imagine quite some
> > difficulties.
> > => So the library must work internally in 64 bit mode.
> 
> The premis, I agree with, but my conclusion is
> => so the library user must specify if it wants to write a 32bit or 64bit file
> in advance, using a flag in the primary TIFFOpen call.

Your earlier question is also valid for the library user (programmer):
It does not 
always know in advance if it needs 32/64 bit. Or you get the scenario in
which the 
programmer selects 32 bit and at some time an Exception/error will occur
as data 
doesn't fit in 4GB. 
This could imply that all work on the bitmap(s) has to be redone, now in
64bit mode, 
which takes a lot of time. (Worst case you lose customers). I expect
that after such
experience most programmers will select 64 bit, or there must be a hard
requirement 
for 32 bit only.

regards,
rob tillaart
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