GIF images contain 256 or fewer colors. Some good examples are cartoon art, clip art6, black and white images, or images with many solid color areas, we have to also use gif if we want to create our image to contain transparent area, or if we want to create an animation that does not require a special plug in or browser helper.
JPEG images are best for photographic quality or high-resolution 3D rendered graphics, because they can display true color image to great effect. Most image editing programs enables you to specify how much to compress a JPEG image. The size of the file decreases the more an image is compressed; however compression also deteriorates the quality and appearance of the image if you go overboard.
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