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JPEG Images: Versatile and Spacesavers
PEG (Joint Photographic Experts Group) images, like GIFs, are graphic image files that Web browsers like Netscape Navigator and Internet Explorer can read and display. But, while GIFs are limited to use on-screen because of their 8-bit, 256-color maximum, index color mode, JPEGs can be used for a whole lot more.

JPEGs are bitmap images and can be edited/created by image-editing software. They're used primarily for photographic images because of their 24-bit color range. You can save a JPEG in either RGB or CMYK color mode at whatever resolution is needed. JPEGs have an image compression option which can prove helpful for transporting them over a network or via transport media like CD-ROMs and Zip disks.

Image compression, unlike file compression however, doesn't come without its sacrifices. JPEG compression is a "lossy" form of compression which means that, when it is used, a certain amount of data contained in the image file is discarded. Once it's gone you can't get it back; it's gone for good. The upside to the compression is that a designer can decide, when saving the image, how much compression one would like to use. With a great amount of compression, one gets smaller file size but will lose quite a bit of data from the image. With small amounts of compression, one will have a larger sized file but very little data will be lost from the image. The key, when working with JPEG image compression, is to find the acceptable balance for a particular image and its intended uses.

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