TweakPNG

TweakPNG is a low-level utility for examining and modifying PNG image files. It runs on Windows 95 or higher (98, ME, 2000, XP, etc.). In order to use it, you will need to be at least somewhat familiar with the internal format of PNG files. For information about PNG, see the PNG home page.

A screenshot of TweakPNG:

screenshot of TweakPNG

To download TweakPNG, save the following link:

tweakpng-1.2.1.zip (about 200K) 11 Dec 2004

You can also view the README file.

To install it, just create a directory and unzip the files into it. To run it, open tweakpng.exe.

TweakPNG is available for free under the terms of the GNU General Public License (GPL). The C++ source code for TweakPNG is included the zip file.


History

v1.2.1 (11 Dec 2004):

v1.2.0 (29 Dec 2003): v1.1.2 (24 Nov 2003): v1.1.1 (3 Jan 2001): v1.1.0 (28 Dec 2000):

v1.0.1 (27 Dec 1999): A few minor bugfixes; more graceful handling of most invalid files; automatic validation on Save; uses standard color picker when appropriate (but usually it's not)

v1.0.0 (3 Dec 1999): Initial release


TweakPNG was written by Jason Summers. You may send comments and inquiries concerning TweakPNG to jason1@pobox.com.

Comments are welcome, but please keep in mind that this program is not even intended to be friendly to non-technical people, and is no longer being actively developed (at least not by me).


See also pngrewrite, a utility to help optimize paletted PNG images.


The official location of this page is <http://pobox.com/~jason1/tweakpng/>.