Editing Incubator escapee wiki:Graphics tutorials (section)

==== [[Open source]] programs ====
*[https://pngquant.org/ pngquant] - program that reduces PNG size by automatically reducing the number of colors. Visually lossless most of the time.
*[http://pmt.sourceforge.net/pngcrush/ PNGCrush] - Old tried and true program that reduces PNG sizes using multiple [[zlib]] compression trials on disk.
*[http://optipng.sourceforge.net/ OptiPNG] - Essentially a newer version of PNGCrush, it economizes the trial (reducing from 100s of short ones to a maximum of 7 longer ones) and does everything in memory. Usually produces identical results, and is much faster.
*[http://advancemame.sourceforge.net/comp-readme.html AdvanceCOMP] - A group of programs designed to reduce ZIP compression in many contexts, including PNGs (using AdvPNG).
*[http://www.sentex.net/~mwandel/jhead/ Jhead] - A program for viewing, altering, or removing [[Exif]] data of JPEGs. Amongst other things, this allows for reducing file sizes.
*[http://nikkhokkho.sourceforge.net/static.php?page=FileOptimizer FileOptimizer] - A  [[Windows]] [[GUI]] program (recommended for beginners) that uses multiple open source and freeware tools (including most of those listed here) to optimize a large number of media filetypes. Achieves better compression than any of the others used by themselves. Released under the LGPL.