Saturday, July 5, 2008

JPEG

This format was designed to transfer graphic data and images over digital networks and was generally used to hold and transfer full color photorealistic images. Before JPEG, there were very few formats, which supported 24-bit halftone images. TIFF and BMP formats allowed holding 24-bit data, but they failed to perform lossless compression of the data, which contained 1000 colors from the real world, on the high quality level. JPEG compresses photos, though with quality loss. Photos and multi-color images, transferred in this format, are ideal for networking. It is not possible to refine JPEG images, though it is possible to debase them by decreasing the file size. This format is primarily used to hold photorealistic graphic images with a large number of colors. Compressed data capacity depends on image contents. JPEG supports Progressive JPEG standard, which conceptually looks like interlaced in the GIF format. This means that the JPEG Progressive format images are loaded by parts, which are displayed, as they are loaded. Such a format is good for large files.

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