2017.09.01 14:06 "Re: [Tiff] problems saving BigTIFF format", by Paul Hemmer

Thanks everyone for the help. Bob, Kemp, great info and assistance.

I ended up rebuilding everything from a clean slate in the same MSVC2015 environment and now the 4GB+ TIFF files can be opened in supported viewers.

Have a good weekend!

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Subject: Re: [Tiff] problems saving BigTIFF format

On Thu, 31 Aug 2017, Paul Hemmer wrote:

> Hi Bob,
>
>
> Using 64bit Windows 10, MSVC 2015.. My colleague actually did the
> compile from the sources he pulled down from the LibTIFF site. Are
> there precompiled binaries available anywhere online?
>

> Agreed, it is suspect that it claimed to be exactly 4.0GB in size, it should have been more like 4.6

A key factor is if 'tif_unix.c' or 'tif_win32.c' is used in the build.

For recent enough Visual Studio (perhaps MSVC 2005 and later), I think

that 'tif_unix.c' can support large files by using special large file
(64-bit offset) versions of the stdio functions. I think that the
'tif_win32.c' source file should support large files by using the
WIN32 specific I/O functions. GraphicsMagick provides its own I/O
functions to libtiff and uses TIFFClientOpen(), and its own I/O
functions use C stdio with the 64-bit versions of the functions, or
memory mapped files.

You should definitely be using the exact same compiler and compiler

options to build libtiff as you are using for your own application.

Visual Studio runtimes are very fragile.

Make sure that you are using libtiff version 4.0.8 since that is the

current release.

Bob
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