Optimize PNG images and convert other lossless format (BMP, GIF, TGA...) images to PNG
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README.md

PngOptimizer PngOptimizer logo

A graphics and command line tools to optimize PNGs and convert other lossless formats (GIF, BMP, TGA) into optimized PNGs.

  • The PngOptimizer application in the "projects" directory is distributed under the terms of the GNU General Public Licence.
  • The PngOptimizerCL application in the "projects" directory is distributed under the terms of the GNU General Public Licence.
  • The poeng library in the "sdk" directory is distributed under the terms of the GNU Lesser General Public Licence.
  • The chuwin32 library in the "sdk" directory is distributed under the terms of the Zlib licence.
  • The chustd library in the "sdk" directory is distributed under the terms of the Zlib licence.
  • The chustd uses the Zlib library, distributed under the terms of the ZLib licence.
  • The unit_tests directory uses the Google Test framework, distributed under the terms of the new BSD license.

How to build PngOptimizer?

For Windows:

  1. Use Microsoft Visual Studio 2015 and open projects/pngoptimizer/PngOptimizer.sln
  2. Build the solution, in either Debug or Release mode, and for Win32 (x86) or x64.

The final build result, PngOptimizer.exe, is located into the Win32-Debug, Win32-Release, x64-Debug or x64-Release sub-directory of the PngOptimizer directory.

For Linux:

  1. Open a terminal

  2. Ensure you have build tools. To get the build tools on Ubuntu, open a terminal and execute this command: sudo apt install build-essential

  3. Ensure you have GTK+ development package: sudo apt-get install libgtk-3-dev

  4. Change directory to projects/pngoptimizer/

  5. Execute command: make or make CONFIG=release

    These commands build in debug and release configuration respectively. The build results are located in the linux-debug/ or linux-release/ directories.

On Linux, make accept other targets: clean, run, install, uninstall, cov. Open sdk/chulib.mki for a description at the top of the file.

The SDK libraries have subdirectories where build files are stored:

  • Win32-Debug for the Windows 32-bit debug version
  • Win32-Release for the Windows 32-bit release version
  • x64-Debug for the Windows 64-bit debug version
  • x64-Release for the Windows 64-bit release version
  • linux-debug for Linux 64-bit debug version
  • linux-release for Linux 64-bit release version
  • linux-coverage for Linux 64-bit debug+coverage version (used when calling make cov)

How to build PngOptimizerCL?

For Windows: same as PngOptimizer except you need to open projects/pngoptimizercl/PngOptimizerCL.sln

For Linux: same as PngOptimizer except you need to change directory to projects/pngoptimizercl, and the GTK+ development package is not needed.


To build all and create the packages to be downloaded, call from a terminal:

  • On Windows: distrib/make-distrib.bat
  • On Linux: distrib/make-distrib.sh

Packages will be created in the distrib/download directory.