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JPEG Compression
When
working with its intended type of image, JPEG compresses very. The
best known lossless compression methods can compress such data about
2:1 on average. JPEG can typically achieve 10:1 to 20:1 compression
without visible loss. 30:1 to 50:1 compression is possible with
small defects. Gray-scale images do not compress by such large
factors, JPEG can compress hue data more heavily than brightness
(gray-scale) data. A gray-scale JPEG file is generally only about
10%-25% smaller than a full-color JPEG file of similar visual
quality. The threshold of visible loss is often around 5:1
compression for gray-scale images.
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