| JPE file |
| An optional extension used for JPEG files. Some Sony cameras have an option for simultaneously recording a low-res file for e-mail attachments that is saved as a .JPE along with the high-res .JPG file. Some Minolta cameras use the .JPE extension for images that contain embedded color profiles, and .JPG for ones that do not. Most image editors treat .JPE files as ordinary JPEGs, while other applications do not recognize the file type at all. See JPEG. |
| JPEG |
| (Joint Photographic
Experts Group) Pronounced "jay-peg."
An ISO/ITU standard still image format that is very popular due to
its excellent compression capabilities. JPEGs are widely used on the
Web for photographic images, but are not as well suited for
compressing charts and diagrams, as text can become fuzzy (GIFs are
better for text). JPEGs use the JPEG File Interchange Format (JFIF), and file extensions are .JPG or .JFF. M-JPEG and MPEG are variations of JPEG used for full-motion digital video (see MPEG). JPEGs Are Lossy Using discrete cosine transform, JPEG provides lossy compression (you lose some data from the original image). It depends on the image, but ratios of 10:1 to 20:1 may provide little noticeable loss. The more the loss can be tolerated, the more the image can be compressed. Compression is achieved by dividing the picture into tiny pixel blocks, which are halved over and over until the desired amount of compression is achieved. JPEGs can be created in software or hardware, the latter providing sufficient speed for realtime, on-the-fly compression. C-Cube Microsystems introduced the first JPEG chip. See JPE file and GIF.   |