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JIF
JPEG Image Format (filename extension).
JPEG
Joint Photographic Experts Group. JPEG format supports full 24-bit color. It compresses images by accurately recording the brightness of each pixel but averaging out the hues, which our eyes distinguish less accurately. It's really a description of an image -- not the actual image. The viewer's Web browser or graphics application decodes this description into a bitmap that looks something like the original image. The accuracy of the reconstructed image the viewer sees depends on the level of detail in the description. JPEGs work very well for photographs with gradual color changes and no sharp edges. It gets sticky when you make a graphic that consists of a photo with some stylized text over it. The photo will display best as a medium quality jpeg, but the text will look bad because jpegs are poor at displaying the abrupt color changes that you see in graphic text. The text will display best as GIF, but the photo will not look as good because there will almost certainly be far more than 256 colors in it, and there will likely be lots of gradual color transitions that the GIF format is not equipped to handle.
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