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Azalea Society of America | all galleries >> JPEG compression... > books.10x25.jpg
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Since JPEG uses a lossy compression technique, saving a JPEG file back into itself degrades the image quality each time. This image shows the results of saving an image back into itself at a quality of 25% for a total of 10 times.

The degraded quality of this image is more obvious at higher magnification. The next image shows the same part of the original and this image side by side, at 3 times normal size.

other sizes: small medium original
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