Pre-announcing OptiPNG 0.7.10 and recalling version 0.7.9

Cosmin Truta — Sat, 12 Apr 2025 18:50:33 -0000

Dear OptiPNG users,

OptiPNG version 0.7.9 was supposed to contain an important fix, but it ended up being a botched release. (Oopsie!...)

Version 0.7.10 shall be coming up next. Stay tuned!

OptiPNG 0.7.7 released

Cosmin Truta — Thu, 28 Dec 2017 05:40:24 -0000

Dear OptiPNG users,

OptiPNG version 0.7.7, a maintenance update that contains critical and non-critical fixes, has been released. We strongly recommend upgrading.

See the HISTORY document for more information.
http://optipng.sourceforge.net/
https://sourceforge.net/projects/optipng/files/OptiPNG/optipng-0.7.7/

OptiPNG 0.7.6 released

Ramona Truta — Tue, 05 Apr 2016 04:34:44 -0000

Dear OptiPNG users,

OptiPNG version 0.7.6, a maintenance update that contains critical and non-critical fixes, has been released. We strongly recommend upgrading.

See the HISTORY document for more information.
http://optipng.sourceforge.net/
https://sourceforge.net/projects/optipng/files/OptiPNG/optipng-0.7.6/

OptiPNG 0.7.5 released

Cosmin Truta — Tue, 25 Mar 2014 01:07:32 -0000

Dear OptiPNG users,

OptiPNG version 0.7.5, a maintenance update that contains compatibility fixes regarding libpng-1.5 and libpng-1.6, as well as a few other minor additions, has been released. See the HISTORY document for more information.

http://optipng.sourceforge.net/
https://sourceforge.net/projects/optipng/files/OptiPNG/optipng-0.7.5/

OptiPNG 0.7.4 released

Ramona Truta — Mon, 22 Oct 2012 04:48:32 -0000

Dear OptiPNG users,

OptiPNG version 0.7.4, containing a security fix for all previous 0.7.x versions, has been released. (This is a follow-up on the fix issued in version 0.7.3.) We strongly recommend upgrading.

Version Hg has been fixed also.

Version 0.6.5 and earlier are not affected.

See the Security Information section for more details.
http://optipng.sourceforge.net/
https://sourceforge.net/projects/optipng/files/OptiPNG/optipng-0.7.4/

OptiPNG 0.7.3 released

Ramona Truta — Mon, 17 Sep 2012 03:21:08 -0000

Dear OptiPNG users,

OptiPNG version 0.7.3, containing an important security fix for all previous 0.7.x versions, has been released. We strongly recommend upgrading.
Version Hg has been fixed also.

Version 0.6.5 and earlier are not affected.

See the Security Information section for more details.
http://optipng.sourceforge.net/
https://sourceforge.net/projects/optipng/files/OptiPNG/optipng-0.7.3/

Lossless PNG image reductions

Ramona Truta — Sat, 25 Aug 2012 07:41:15 -0000

[This announcement is for the developers of libpng-based PNG encoders.]

The lossless PNG image reduction code (opngreduc) is now available as a top-level module. Making your PNG encoder more efficient is as easy as an #include "opngreduc.h" and a call to opng_reduce_image().

The principle behind image reductions is explained in detailed in the PNG optimization guide, section 2.1 "The PNG image type".
http://optipng.sourceforge.net/pngtech/png_optimization.html

OptiPNG 0.7.2 released

Ramona Truta — Sat, 25 Aug 2012 07:40:41 -0000

Dear users,

OptiPNG version 0.7.2, a maintenance release that contains minor fixes and library updates, has been released. See the HISTORY document for more information.

http://optipng.sourceforge.net/
https://sourceforge.net/projects/optipng/files/OptiPNG/optipng-0.7.2/

OptiPNG 0.7.1 released

Ramona Truta — Tue, 20 Mar 2012 04:51:03 -0000

Dear OptiPNG users,

An important image-altering regression, affecting version 0.7, has been fixed. We strongly recommend upgrading to version 0.7.1, which is now available.

Version Hg has been fixed also.

Version 0.6.5 and earlier are not affected.

http://optipng.sourceforge.net/
https://sourceforge.net/projects/optipng/files/OptiPNG/optipng-0.7.1/

Many thanks to Adam Ciarciński for discovering and fixing this defect.

OptiPNG available on Mercurial repo

Ramona Truta — Tue, 06 Mar 2012 04:37:49 -0000

Dear faithful OptiPNG users,

It is my pleasure to announce the publication of my development branch to a Mercurial repository at SourceForge. You may browse, build, enhance, fork, distribute for free, or make money out of this bleeding-edge (but well-tested!) code, in any way you see fit, as long as you comply to the terms of its license. Should you write code that eventually lands in the main source tree, you will become a contributing author, unless you decline and prefer to assign your copyright to me instead.

And I encourage you to get involved. My own involvement in OptiPNG development has been little, and, at various points in time, it stopped completely, as it is the case now. I have, therefore, decided to have my offline development source tree transfered online, and a volunteer agreed to take care of its maintenance.

Thank you for using OptiPNG, for submitting patches, bug reports and feature requests, and for waiting patiently for as long as it took to get your patches integrated, or your requests implemented.

http://optipng.hg.sourceforge.net/hgweb/optipng/optipng

Sincerely,
Cosmin Truta

Recent posts to news

Pre-announcing OptiPNG 0.7.10 and recalling version 0.7.9

OptiPNG 0.7.7 released

OptiPNG 0.7.6 released

OptiPNG 0.7.5 released

OptiPNG 0.7.4 released

OptiPNG 0.7.3 released

Lossless PNG image reductions

OptiPNG 0.7.2 released

OptiPNG 0.7.1 released

OptiPNG available on Mercurial repo