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<p>[QUOTE=&quot;mrbrklyn, post: 1464893, member: 4381&quot;]<a href="http://en.wikipedia.org/wiki/Image_file_formats" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Image_file_formats" rel="nofollow">http://en.wikipedia.org/wiki/Image_file_formats</a></p><p><br /></p><p>PNG</p><p><br /></p><p>The PNG (Portable Network Graphics) file format was created as the free, open-source successor to the GIF. The PNG file format supports truecolor (16 million colors) while the GIF supports only 256 colors. The PNG file excels when the image has large, uniformly colored areas. The lossless PNG format is best suited for editing pictures, and the lossy formats, like JPG, are best for the final distribution of photographic images, because in this case JPG files are usually smaller than PNG files. The Adam7-interlacing allows an early preview, even when only a small percentage of the image data has been transmitted.</p><p><br /></p><p>PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-color, grayscale, and truecolor images are supported, plus an optional alpha channel.</p><p><br /></p><p>PNG is designed to work well in online viewing applications like web browsers so it is fully streamable with a progressive display option. PNG is robust, providing both full file integrity checking and simple detection of common transmission errors. Also, PNG can store gamma and chromaticity data for improved color matching on heterogeneous platforms.</p><p><br /></p><p>Some programs do not handle PNG gamma correctly, which can cause the images to be saved or displayed darker than they should be.[2]</p><p><br /></p><p>Animated formats derived from PNG are MNG and APNG. The latter is supported by Mozilla Firefox and Opera and is backwards compatible with PNG.</p><p><br /></p><p><a href="http://www.scantips.com/basics09.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.scantips.com/basics09.html" rel="nofollow">http://www.scantips.com/basics09.html</a></p><p><br /></p><p>Also when you step on an image&nbsp; more than a few times the JPG visibly starts to dither.</p><p><br /></p><p>If your not sure of the technical facts of something, you can look it up.[/QUOTE]</p><p><br /></p>

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