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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.
Creates APNG animation from PNG/TGA image sequence.
Creates highly optimized Animated PNG files from PNG/TGA image sequences. CLI versions available for all major OSes. GUI versions for Windows and macOS.
Also, APNG Disassembler can be found at http://sourceforge.net/projects/apngdis
This program converts APNG animations into animated GIF format. Wu64 quantization is used for true-color files. Transparency is handled either using a threshold, or composed over chosen background color. CLI version is OS-independent, GUI version is available for Windows.
Another converter: http://sourceforge.net/projects/gif2apng
Deconstruct APNG file into a sequence of PNG frames.
This program converts APNG file into a sequence of individual PNG frames. Command-line interface and GUI viersions.
Also, APNG Assembler can be found at http://sourceforge.net/projects/apngasm
This program converts GIF animations into animated PNG format. Usually it makes the files smaller. CLI version is OS-independent, GUI version is available for Windows.
Another converter: http://sourceforge.net/projects/apng2gif
CxImage is a C++ image processing library. It can load, save, display, transform images in a very simple and fast way, with transparency, multiple layers and selections, support for BMP GIF JPG PNG MNG TIF ICO TGA PCX J2K JBG RAS PNM RAW PSD
OpenCTM is a file format, a software library and a tool set for compression of 3D triangle meshes. The geometry is compressed to a fraction of comparable file formats (3DS, STL, COLLADA...), and the format is accessible through a simple, portable API