GraphicsMagick Authors

The following people have contributed substantially to the development of GraphicsMagick. Please let us know if an author is missing, or a significant contribution was made and not recorded.

Active GraphicsMagick Contributors

Bob Friesenhahn
Principal maintainer of GraphicsMagick. Author of Magick++ (C++ API to ImageMagick and GraphicsMagick). Author of module loader facility, automatic file identification (magic) support, Unix/Cygwin/MinGW configure/make facility, Windows setup.exe style installer, WMF renderer, C API documentation formatter, and the C, C++, and Perl test suites used by ImageMagick and GraphicsMagick.
Glenn Randers-Pehrson
Contributed significantly to the utilities, including writing the 'gm' utility wrapper. Authored support for JNG, MNG, and PNG formats. Provided significant support for the BMP format. Significant improvements to the documentation, including creating a documentation authoring environment based on the <imdoc> format. Maintains the SourceForge mailing lists.
Jaroslav Fojtik
Authored the ART, CUT, JNX, MAC, MATLAB, TOPOL, and WPG coder modules. Improved the FITS and TXT coder modules.

Kenneth Xu

Contributed the implementation of 'gm batch', a simple batch mode for GraphicsMagick.

Troy Patteson

Contributed a several significant patches to fix image rotation bugs and improve image rotation performance, as well as an improved bi-linear interpolation implementation.

Sara Shafaei

Contributed a number of Wand API functions as well as fixes for several composition operators.

Brendan Lane

Contributed a large number of new Photoshop composition operators and alpha-channel fixes for existing ones.

Dirk Lemstra

Contributed improvements to the VisualMagick configure program to support configuring more build options via the GUI dialogs and to deal with similarly named files.

Roman Hiestand

Contributed WebP coder improvements.

Former GraphicsMagick Contributors

Mike Chiarappa
Created and maintains the Borland C++ Builder 6.0 build environment for GraphicsMagick.
Daniel Kobras
Provided many security patches and fixes from the Debian project.
William Radcliffe
Author of the VisualMagick project configure facility for Visual C++. Author of FlashPix module. Author of the ImageMagickObject COM object for Windows. Author of the EMF, XTRN, and META coders. Significant contributions to the MSL, JPEG, TIFF, SVG, and URL coders. Authored "process" module support. Wrote the micro-timer facility used by 'identify'. Ported module loader support to Windows. Significantly improved polygon rendering performance.
Leonard Rosenthol
Authored the 'conjure' utility and associated MSL execution environment. Provided MacOS support. Authored the CLIPBOARD, XCF, and PSD coders. Postscript and PDF expertise. Significant drawing enhancements including support for dash patterns, linecap stroking, clipping masks and a mask image.
Lars Ruben Skyum
Contributed the -clippath functionality, added -define support, improved color profile support, and re-wrote the PS3 coder.
Rolf Schroedter
Principal author of TclMagick.
David N. Welton
Co-author of TclMagick, particularly in the Unix environment.
Mark Mitchell
Contributed a new design for the web pages, including the formatting scripts, and converted many pages to the new format.
Richard Nolde
Contributed code for converting between native floating point types, and short (16/24) bit float types.
Clément Follet
Contributed Hald CLUT and ASC-CDL implementations.
John Sergeant
Re-wrote the HP PCL writer to work much better, including support for compression. Implemented support for CALS type 1 format. Re-wrote the DICOM reader.

Roberto de Deus Barbosa Murta

Contributed the adaptive threshold implementation (-lat), which executes in linear rather than quadratic time.

Other Contributors (via ImageMagick)

John Cristy
Creator, principal author, and principal maintainer of ImageMagick, from which GraphicsMagick is originally derived (from ImageMagick 5.5.2). Also the author of the Wand API to ImageMagick which is incorporated as a stand-alone library by GraphicsMagick.
Kelly Bergougnoux
Authored the initial Cineon coder (which has since been replaced).
Christopher R. Hawks
Authored the PALM coder.
Francis J. Franklin
Ported the WMF coder to the libwmf 0.2 API.
Rick Mabry
Contributed code to support filling drawn objects using a pattern image.
Nathan Brown
Original author of the JP2 coder.
Kyle Shorter
Original author of PerlMagick. Original author of the LOCALE coder.
Markus Friedl
Original author of Base64 encode/decode sources.
David Harr
Contributed (with Leonard Rosenthol) dash pattern, linecap stroking algorithm, and minor rendering improvements.
Troy Edwards
Authored the source RPM spec file for GraphicsMagick.
Milan Votava
Contributed support for Wireless BitMap, used in WAP - Wireless Access Protocol.
Mike Edmonds
Contributed the median filter algorithm.

Additional Acknowledgements

David Pensak, E. I. du Pont de Nemours and Company
For providing the computing environment that made developing ImageMagick possible.
Alexander Zimmermann
Responsible for the ImageMagick Linux binary distributions for many years. His efforts are very much appreciated.
Paul Heckbert, Carnegie Mellon University
Image resizing is based on Paul Heckbert's Zoom program.
Paul Raveling, USC Information Sciences Institute
The spatial subdivision color reduction algorithm is based on his Img software.
Michael Halle, Spatial Imaging Group at MIT
For the initial implementation of Alan Paeth's image rotation algorithm.
Peder Langlo, Hewlett Packard
Made hundreds of suggestions and bug reports. Without Peder, this software would not be nearly as useful as it is today.
Rod Bogart and John W. Peterson, University of Utah
Image compositing is loosely based on rlecomp of the Utah Raster Toolkit.
Alvy Ray Smith and Eric Ray Lyons
HWB color transform and algorithm.
Thomas R Crimmins
Inventor of the eight hull algorithm used for speckle reduction.

Copyright (C) 2002 - 2015 GraphicsMagick Group

This program is covered by multiple licenses, which are described in Copyright.txt. You should have received a copy of Copyright.txt with this package; otherwise see