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Save the file as PNG with alpha. Upload the icon, tagged as {{non-free computer icon}} or {}. If the icon is from a pre-OSX application, you may wish to consider optimizing it in an image editor. Converting an older format icon to PNG-8 from PNG-24 should shave off about 1/3 of the file size.
PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF)—unofficially, the initials PNG stood for the recursive acronym "PNG's not GIF". [ 6 ] PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without an alpha channel for transparency), and ...
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If the image you wish to upload is not under a free license, but meets all of Wikipedia's fair use criteria, then you are permitted to upload it directly into the English Wikipedia with a fair use rationale. Keep in mind that it is not permitted to upload fair use images into Wikimedia Commons, but it is permitted to do so into English ...
The uploader or another editor requests that a local copy of this file be kept. This image or media file is available on the Wikimedia Commons as File:Wikipedia-logo-v2.svg, where categories and captions may be viewed.
optipng -o7 file.png advdef -z4 file.png pngout /ks file.png deflopt file.png Each of these utilities uses a different, more sophisticated "deflate" compression method variant on the PNG and generally produces a smaller file when run after the other tools. If the smallest result matters, try some experimenting to see what produces the best result.
In addition, transparency is often an "extra" for a graphics format, and some graphics programs will ignore the transparency. Animated PNG 8-bit transparency. Raster file formats that support transparency include GIF, PNG, BMP, TIFF, TGA and JPEG 2000, through either a transparent color or an alpha channel.
A Wikipedia reader can click on the thumbnail, or on the small double-rectangle icon below it, to see the corresponding file page which will let the user see the image in its original size. Although the above text may appear in multiple lines for formatting purposes, the actual image text is on one line, as it uses spaces without any line breaks.