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An [Acronym] for __P__ortable __N__etwork __G__raphics. Pronounced "ping". A modern, losslessly compressed bitmapped graphics FileFormat, designated by the [W3C] as the successor of the [GIF] format. [PNG] is completely unencumbered with patents and licensing fees. This is important, as [GIF] has had problems in that regard (see [Unisys]). There is builtin support for [PNG] in [Mozilla] and [Opera]. Recent versions of InternetExplorer display [PNG] images as well, however this browser does not support alpha channels natively. Rumour has it that the IE engine is too old and outdated to support transparency without lots of hideous hacks. Amusingly(?), while MicrosoftCorporation can't make these hideous hacks, they [tell us how we can | http://support.microsoft.com/default.aspx?scid=kb;en-us;Q294714]. Not surprisingly, their approach is completely incompatible with every other browser on the world, you should use [a slightly different method | http://webfx.eae.net/dhtml/pngbehavior/pngbehavior.html]. pngcrush(1) is a [Free] utility to shrink your [PNG] images as much as possible, either losslessly or lossily depending on arguments.
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FFmpeg
Unisys
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MNG
GimpVersusPhotoshop
GIF
JPEG
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