Duplicate photo deleter now can locate duplicate photos in all popular graphic formats, including JPEG. This graphic format was created by the organization, named Joint Photographic Experts Group.
JPEG (pronounced "jay-peg") is a standardized image compression mechanism. JPEG stands for Joint Photographic Experts Group, the original name of the committee that wrote the standard.
JPEG compression is lossy, meaning that the decompressed image isn't quite the same as the one you started with. JPEG is designed to exploit known limitations of the human eye, notably the fact that small color changes are perceived less accurately than small changes in brightness. Thus, JPEG is intended for compressing images that will be looked at by humans. If you plan to machine-analyze your images, the small errors introduced by JPEG may be a problem for you, even if they are invisible to the eye.
JPEG compression is designed for compressing either 16 million color (24 bit) or 256 gray scale images of natural, real-world scenes. It works well on photographs, naturalistic artwork, and similar material; not so well on lettering, simple cartoons, or line drawings.
A useful property of JPEG is that the degree of lossiness can be varied by adjusting compression parameters. This means that you can trade off file size against output image quality. Most JPEG compressors let you pick a file size vs. image quality tradeoff by selecting a quality setting. The quality scale is purely arbitrary; its not a percentage of anything.
For full-color images, the uncompressed data is normally 24 bits/pixel. 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, bringing the effective storage requirement down to 1 to 2 bits/pixel. 30:1 to 50:1 compression is possible with small to moderate defects, while for very-low-quality purposes such as previews or archive indexes, 100:1 compression is quite feasible.
An image compressed 100:1 with JPEG takes up the same space as a full-color one-tenth-scale thumbnail image, yet it retains much more detail than such a thumbnail.
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