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.
The primary web site for PNG is www.libpng.org/pub/png.
The primary public ftp site for libpng is ftp://ftp.simplesystems.org/pub/png.
The ftp site for beta versions of libpng is ftp://ftp.simplesystems.org/pub/png-group/.
The current public and beta versions of libpng are available at https://sourceforge.net/project/showfiles.php?group_id=5624.
There are pointers to various distributions of libpng and MD5 checksums here.
The Sourceforge project page for libpng is at https://sourceforge.net/projects/libpng/
A "git" repository for libpng is available. You can access it by cloning git://git.code.sf.net/p/libpng/code or you can browse it here. At present, there are eight branches (libpng00, libpng10, libpng12, libpng14, libpng15, libpng16, libpng17, and a "master" branch which is roughly equivalent to the "libpng16" branch. The development occurs in the "libpng16" and "libpng17" branches; parts of the new developments are also ported to the "libpng15" branch; the rest are just for legacy and security purposes. There is a clone of the repository at github.com/glennrp/libpng.
A "doxygen" index for various releases is available at fossies.org/libpng.
A "compatibility analysis" of libpng releases is available at upstream.org.
The Coverity project for libpng is at https://scan.coverity.com/projects/4061. The project is set up to scan the head of each of the libpng10 through libpng17 branches (libpng00 is not included). As of February 27, 2015, libpng-1.0.63, libpng-1.2.53, libpng-1.4.16beta02, libpng-1.5.22beta04, libpng-1.6.17beta06, and libpng-1.7.0beta53 were all reported to be defect-free.
The mailing list for libpng developers and developers of libpng-based applications is png-mng-implement (at) lists.sourceforge.net. Visit http://png-mng.sourceforge.net/pub/png/pngmisc.html#lists to subscribe. (archived here)
Bug reports can be sent to the mailing list or submitted via the SourceForge Bug tracker
Feel free to download and use the official PNG logo (size 88x31) with your application documentation and web pages:
This site belongs to the PNG Development Group and is maintained for the group by Glenn Randers-Pehrson glennrp at users.sourceforge.net
Web space for this project is being provided by sourceforge.net