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Wikipedia:Graphics tutorials

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Various Wikipedians have put together graphics tutorials. Some of these are still works in progress. It is preferred to work with open formats (such as PNG or SVG) and free licenses (such as public domain or GFDL) when possible. There are many free software programs available for creating and editing images.

Main page: Wikipedia:Graphs
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Tutorials

Vector graphics tutorials

Today's featured article 1908 two-and-a-half dollar piece (obverse and reverse) The Indian Head gold pieces were two coin series struck by the United States Mint: a two-and-a-half dollar piece, or quarter eagle (1908–1915, 1925–1929), and a five-dollar coin, or half eagle (1908–1916, 1929). The only US coins with recessed (engraved) designs ever to enter circulation, they were the last of a long series of coins in those denominations. President Theodore Roosevelt vigorously advocated new coin designs, and had the Mint engage his friend, the sculptor Augustus Saint-Gaudens, to design coins that could be changed without congressional authorization. The sculptor completed an eagle ($10 piece) and double eagle before his death in 1907. Roosevelt convinced Mint Director Frank Leach to reproduce the eagle's design on both of the smaller coins, but recessed below the background. The job fell to Boston sculptor Bela Lyon Pratt, and after some difficulty, the Mint was able to strike the coins, though Pratt was unhappy with modifications made by the Mint's engravers. The quarter eagle enjoyed popularity as a Christmas present, but neither coin circulated much.

Specific tasks

Bitmap graphics tutorials

Photo editing tutorials

Combination tutorials

Filesize optimisation tutorials

Open source programs

  • PNGCrush - Old tried and true program that reduces PNG sizes using multiple zlib compression trials on disk.
  • 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.
  • AdvanceCOMP - A group of programs designed to reduce ZIP compression in many contexts, including PNGs (using AdvPNG).
  • Jhead - A program for viewing, altering, or removing Exif data of JPEGs. Amongst other things, this allows for reducing file sizes.
  • 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

  • PNGOUT - A program that optimizes PNGs by eschewing the usual zlib compression for a slower but more complete algorithm.
    • PNG Gauntlet - GUI for OptiPNG, PNGOUT, and DeflOpt (similar to AdvPNG in AdvanceCOMP)
  • Image Analyzer - Amongst other things, allows for lossy compression of PNG files. (Often, however, merely posterizing the image at a level that does not produce color banding results in smaller files of the same or higher quality.)
  • JPG Cleaner - Removes Exif data from JPEGs, making the files smaller.
  • JPGExtra and PNGExtra - Programs that losslessly optimize JPEGs and PNGs by cleanly removing all non-image data.

Software used for Wikipedia images

Vector graphics software

3D software

Raster graphics (bitmap) software

Word processors with vector-graphics facilities

Panorama software

  • Grokking the GIMP: a comprehensive on-line book covering the GIMP, as well as graphic and digital photo editing in general
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