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JPEG and GIF

The two major Web file formats (JPEG and GIF) are covered in detail in Chapter 10, “Preparing Images for the Web,” so we’ll look at them just briefly here. Of particular note is that you can indeed use the Save As command to save an image as a GIF or JPEG file, with virtually all of the same file options as in the Save for Web dialog box—so the obvious question is why use one saving method over the other when saving for the Web?

The Save for Web dialog box offers several features that the individual GIF and JPEG Save As command dialog boxes don’t. For one, the Save for Web dialog box provides a wonderful before-and-after preview area, displaying side-by-side comparisons of your original and optimized images while an information area displays the optimized version’s file size and projected download time.


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