# Acknowledgments

## Maintainers

The LibTIFF software was written by Sam Leffler while working for Silicon Graphics.

Silicon Graphics has seen fit to allow us to give this work away. It is free. There is no support or guarantee of any sort as to its operations, correctness, or whatever. If you do anything useful with all or parts of it you need to honor the copyright notices. It would also be nice to be acknowledged.

LibTIFF as been maintained by cast of others since 1999.

The persons currently actively maintaining and releasing libtiff are:

- Even Rouault

- Bob Friesenhahn

Significant maintainers in the past (since the 3.5.1 release) were:

- Frank Warmerdam

- Andrey Kiselev

- Joris Van Damme

- Lee Howard

## Contributors

The LZW algorithm is derived from the compress program (the proper attribution is included in the source code).

The Group 3 fax stuff originated as code from Jef Poskanzer, but has since been rewritten several times. The latest version uses an algorithm from Frank Cringle – consult `libtiff/mkg3states.c` and `libtiff/tif_fax3.h` for further information.

The JPEG support was written by Tom Lane and is dependent on the excellent work of Tom Lane and the Independent JPEG Group (IJG) who distribute their work under friendly licensing similar to this software. Joris Van Damme implemented the robust Old JPEG decoder (as included in libtiff since version 3.9.0, there was another Old JPEG module in older releases, which was incomplete and unsuitable for many existing images of that format).

JBIG module was written by Lee Howard and depends on JBIG library from the Markus Kuhn.

Many other people have by now helped with bug fixes and code; a few of the more persistent contributors have been:

Contributors
Bjorn P. Brox
Dan McCoy
J.T. Conklin
Richard Minner
Frank D. Cringle
Richard Mlynarik
Soren Pingel Dalsgaard
Niles Ritter
Steve Johnson
Karsten Spang
Tom Lane
Peter Smith
Brent Roman
Mike Welles
Frank Warmerdam
Greg Ward
Stanislav Brabec
Roman Shpount
Peter Skarpetis
Arvan Pritchard
Bernt Herd
Joseph Orost
Phil Beffery
Ivo Penzar
Francois Dagand
Albert Chin-A-Young
Bruce A. Mallett
Dwight Kelly
Andrey Kiselev
Ross Finlayson
Dmitry V. Levin
Bob Friesenhahn
Lee Howard
Joris Van Damme
Tavis Ormandy
Richard Nolde
Even Rouault
Roger Leigh

(apologies to anyone that was inadvertently not listed.)