Surf these sites: Encyclopedia of Graphics File Formats -- Book (2nd Edition) plus complete reference on CD-ROM GIF vs. JPEG -- GIF and JPEG (JPG) image formats are different. You should know which to use one vs. the other. Graphics File Format Page, The -- A detailed description of most of the graphics file formats. JPG vs GIF -- A comprehensive article on the differences between the file formats. W3C Overview of Web Graphics -- Information from the World Wide Web Consortium (W3C) on format comparisons, integration into HTML and XML
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