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Sams Teach Yourself Internet and Web Basics All in One by T. Michael Clark, Bob Temple, Ned Snell

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Working with File Formats

One of the main concerns for any Web page designer is download time. The simple fact is, if your Web page takes too long to download to a user's computer, that user might get bored and simply jump to some other place on the Web. One way in which you can ensure that your page takes a reasonable amount of time to download is to compress your images. Compression is a process that shrinks a file down to essential data only. As you might suspect, compression also takes a bit of the clarity and detail away from the graphic image—although some images are affected very little by compression. As we continue through this chapter, you'll learn to identify the compression method you should use for each image (yes, there is more ...

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