Editing Incubator escapee wiki:Graphics tutorials (section)

=== Filesize optimisation tutorials ===
*[[Wikipedia:Preparing images for upload]] - Describes how to keep image file sizes as small as possible.
*[[Wikipedia:How to reduce colors for saving a JPEG as PNG|How to reduce colors for saving a JPEG as PNG]] (using The GIMP)

==== [[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.

==== [[Freeware]] programs ====
*[http://advsys.net/ken/utils.htm PNGOUT] - A program that optimizes PNGs by eschewing the usual [[zlib]] compression for a slower but more complete algorithm.
**[http://pnggauntlet.com PNG Gauntlet] - GUI for OptiPNG, PNGOUT, and DeflOpt (similar to AdvPNG in AdvanceCOMP)
*[http://logicnet.dk/Analyzer/ Image Analyzer] - Amongst other things, allows for [[lossy]] compression of PNG files. (Often, however, merely [[posterize|posterizing]] the image at a level that does not produce [[color banding]] results in smaller files of the same or higher quality.) 
*[http://www.rainbow-software.org/programs.html#JPG%20Cleaner JPG Cleaner] - Removes Exif data from JPEGs, making the files smaller.
*[http://www.fieggen.com/software/jpgextra.htm JPGExtra] and [http://www.fieggen.com/software/pngextra.htm PNGExtra] - Programs that losslessly optimize JPEGs and PNGs by cleanly removing all non-image data.