PNG Reference Library: libpng

This is an open source project to develop and maintain the reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files.

Updates

• UPDATE 10 September 2009: The latest released versions are libpng-1.0.50 and libpng-1.2.40.
• UPDATE 10 November 2009: The latest development versions are libpng-1.2.41beta17 and libpng-1.4.0beta95. Both add macros to detect various deprecated usage such as direct reference to members of png_struct and info_struct, and make those new macros configurable. Unless bugs are discovered, these will be the last betas before the "rc" releases.
• UPDATE 31 March 2009 A "git" repository for libpng has been developed.

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Ghostscript

Ghostscript is a package of software that provides:

• An interpreter for the PostScript (TM) language, with the ability to convert PostScript language files to many raster formats, view them on displays, and print them on printers that don't have PostScript language capability built in;
• An interpreter for Portable Document Format (PDF) files, with the same abilities;
• The ability to convert PostScript language files to PDF (with some limitations) and vice versa; and
• A set of C procedures (the Ghostscript library) that implement the graphics and filtering (data compression / decompression / conversion) capabilities that appear as primitive operations in the PostScript language and in PDF.

Ghostscript is written entirely in C, with special care taken to make it run properly on a wide variety of systems, including MS Windows, Apple MacOS, the wide variety of Unix and Unix-like platforms and VMS systems.

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