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JPG with and without multiple edits

Photos can look good in JPG or they can look very, very bad. | Graphics Glossary | Alpha Index to Full Glossary:

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JPG or JPEG is a bitmap format developed specifically for photographic images by the Joint Photographic Experts Group. It is best used for on-screen display or email exchange of large low-resolution photographs and other images with millions of colors and for temporary storage, such as on digital camera memory cards.

JPEG may look good on-screen and may produce nice inkjet prints, but it is not suitable for high resolution commercial printing. The relatively low file size of large JPEGs is achieved with a lossy compression scheme that tosses out bits of data — information about the image — each time it is edited and then saved. Images requiring editing should first be saved as TIFF or some other lossless format.

Pronunciation: jay-peg
"In the sidebar images the upper photo from my digital camera was edited and saved only once. Beneath it, the same image was edited and saved a few more times to demonstrate the effect of the destructive or lossy compression used by JPEG. You can see the fuzziness in the power lines."
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