OptiPNG 0.6.4 (PNG Optimizer)

OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections.
If you wish to learn how PNG optimization is done, or to know about other similar tools, read the PNG-Tech article A guide to PNG optimization.

How to use: http://optipng.sourceforge.net/manual.html

Changelog: http://optipng.sourceforge.net/history.txt
Homepage: http://optipng.sourceforge.net/

Version 0.6.4 14-mar-2010
-------------
+ Upgraded libpng to version 1.4.1-optipng [private]
+ Upgraded zlib to version 1.2.4-optipng [private]
+ Added the option -nx.
* Clarified the behavior of -nz and the relation between -nz and -o0.
+ Added a filesystem check (resolving normalized paths, symlinks, etc.)
to better detect when the output overwrites the input.
+ Enabled automatic wildcard expansion (i.e. globbing) on Win64.
! Fixed a Unicode build issue on Windows.
(Thanks to Fabien Barbier for the fix.)


http://sourceforge.net/projects/optipng/files/OptiPNG/

older version