The GD.pm perl module is a perl interface to the C code of a similar name and was written by Lincoln Stein. It allows for the generation of GIF (Graphics Inline Format) images from within a perl script. The module itself is available from any CPAN ftp site, and Lincoln maintains an informational web page at:
http://www-genome.wi.mit.edu/ftp/pub/software/WWW/GD.htmlThe gd/GIF.pm module is similar to GD.pm (generates GIFs using gd.c) and was written by Roberto Cecchini who maintains a web page for his module at:
http://www.fi.infn.it/pub/perl/GIF/The JPEG.pm module was written by Nick Ing-Simmons expressly for use with the Tk family of modules. It is distributed on CPAN in the authors/id/NI-S/ directories as a Tk-JPEG-*.tar.gz file.
If you will be interfacing to the pgplot FORTRAN routines you might consider Karl Glazebrook's pgperl which has a web page at:
http://www.ast.cam.ac.uk/~kgb/pgperl.html
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