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Guideline
Not all graphic formats are suitable for the Web. The most commonly used formats are GIF and JPEG, as they are supported by all browsers and can produce images and photos with a very small file sizes.
This table summarizes the typical usage of each format: | Designed For | Usage on the Web | TIFF | Creating, editing and storing high-resolution images for printing. Ideal source for conversion to low-resolution formats | Not suitable because TIFFs can result in large file size and are not Web compatible | GIF | Displaying images with large, flat colour areas (e.g. logos, diagrams and charts) in Web-compatible format | Very suitable, supported by all Web browsers | JPEG | Displaying images at more than 256 colours (e.g. photographs) in Web-compatible format | Very suitable, supported by all Web browsers | PNG | Replacing and improving GIF on the Web and, to some extent, TIFF for editing and preservation | Supported by a number of browsers with exceptions (the status is available here). | WMF
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EMF | Exchanging and storing vector-type images | An exchange format unsuitable for direct access outside of Microsoft Office applications | EPS | Importing, exporting and reusing PostScript language files in all environments | A production and exchange format unsuitable for direct access | SVG | Displaying vector images on Web XML-based media | Not yet fully supported by Web browsers - plug-in is needed |
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