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| Newer page: | version 3 | Last edited on Wednesday, September 15, 2004 3:06:51 pm | by AristotlePagaltzis | |
| Older page: | version 2 | Last edited on Thursday, September 2, 2004 9:59:46 am | by JohnMcPherson | Revert |
@@ -1,17 +1,12 @@
[Acronym] for __J__oint __P__hotographic __E__xperts __G__roup.
-A set of image file formats
well suited for natural images. The "Joint" in the title refers
to the fact that the standard
is a joint effort between
[ISO
] and [ITU
-T
].
+A set of image FileFormat~s
well suited for natural images. Standard [JPEG] uses lossy compression (Discrete Cosine Transform and quantisation)
to significantly reduce file size while maintaining an acceptable image quality. JBIG
is a specialization of
[JPEG
] for bi-level images (ie black
and white). JPEG2000 is a newer, better format using wavelet compression
-- which is [Patent
] encumbered, so you're unlikely to see it implemented in OpenSource software
.
-Like many ISO standards, you
have to pay to get a copy of them
.
+[JPEG] image files commonly
have the FileExtension <tt>.jpg</tt> or <tt>.jpeg</tt>, but rarely <tt>.jpe</tt> also occurs
.
-'Standard' JPEG uses lossy compression (Discrete Cosine Transform
and quantisation)
to significantly reduce file size while maintaining an acceptable image quality
.
+The "Joint" in the name refers to the fact that the standard is a joint effort between [ISO]
and [ITU-T]. Like many [ISO] standards, you have to pay
to get a copy of it
.
-JBIG is a JPEG format for bi-level images (ie black and white).
-
-JPEG2000 is a newer format using 'wavelet' compression, but this format is patent-encumbered, so you probably won't find any OpenSource software implementing it.
-
-Often uses the
[FileExtension]s .jpg or
.jpeg.
-
-Compare
[GIF],
[PNG]
-
-See http://www.jpeg.org/.
+See also:
+*
[The JPEG Homepage | http://www
.jpeg.org/]
+*
[GIF]
+*
[PNG]
