2004.04.15 00:26 "[Tiff] Large TIFF files", by Lynn Quam

2004.04.15 02:17 "Re: [Tiff] Large TIFF files", by Lynn Quam

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?

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.