JPEG
Image
compression standard, optimized for full-color (millions of colors) digital images. You can choose the amount ofcompression, but the higher the compression rate, the less quality the image has. Almost every full-color photograph you see on the Web is a JPG file, while
GIFs are used to display clip-art images (up to 256 colors).
Joint
Photographic
Expert
Group standards for image compression that is an increasingly popular compressed graphics image file, the extension for which is usually
jpg. Because large and high resolution graphics images with considerable color depth require massive amounts of storage (e.g., over 30 Mb) for each image, compression routines that create images almost as good with substantially fewer storage requirements are highly desirable.
Doyle (1994b) calls several options "awesome," including the $940 Fast Electronic's Movie Machine Pro (415-802-0772) with M-JPEG and Avi file capturing options. Similarly, he calls the $570 Intel Smart Video Recorder (800-538-3373) and the $890 Micro Computer microVIDEO DC1 tv (800-249-6476) awesome. JPEG images are generally of sufficient quality that it is not necessary to utilize more storage space for uncompressed files. JPEG compression of graphics images requires no special playback boards. When using any compression utility such as JPEG, it pays to study the limitations. For example, JPEG compression does not work especially well with hard edges and lines in graphics images. Black and white images should never be compressed into JPEG images. Also conversions from GIF to
JPEG may be disappointing since GIF images are usually color reduced before becoming GIF images. Also math coprocessors will not speed up JPEG graphics since JPEG algorithms use only integer arithmetic. JPEG can be used with motion video cards such as the RasterOps MoviePak2 video compression daughter card for Mac computers. (See also
Video board ,
Compression ,
GIF , and
MPEG )
(Joint Photographic Experts Group) -- JPEG is most commonly mentioned as a format for image files. JPEG format is preferred to the GIF format for photographic images as opposed to line art or simple logo art.
JPEG (Joint Photographic Experts Group ) A standard of image compression developed especially for use on the internet.Many of the images you see embedded into web pages are GIFâs,but sometimes,especially in art or photographic Websites,you can clik on the image to bring up a higher resolution(larger) JPEG version of the same image.It is particularly well suited to 3D or VRML images where there is a continuous range of colors or shades.JPEG files use a .jpg or less commonly, .jpeg or .jpe , .jfif extentions.
The term actually stands for "Joint Photographic Experts Group," because that is the name of the committee that developed the format. But don't try to remember this becuase even computer nerds will think you're weird if you mention what JPEG stands for. Instead, remember that a JPEG is a compressed graphic file format. JPEG compression is much better for compressing graphics with photographic color depth than GIF compression is. So, if you see a really colorful image on the web, it is most likely in JPEG format. JPEGs are not limited to a palette of 256 colors like GIFs are, but JPEG is a "lossy" format, which means some quality is lost when the image is compressed. Like GIFs, JPEGs are cross-platform, meaning the same file can be viewed equally on both a Mac and PC.
