Differences between version 2 and predecessor to the previous major change of JPEG.
Other diffs: Previous Revision, Previous Author, or view the Annotated Edit History
| Newer page: | version 2 | Last edited on Thursday, September 2, 2004 9:59:46 am | by JohnMcPherson | Revert |
| Older page: | version 1 | Last edited on Wednesday, September 1, 2004 11:44:56 pm | by StuartYeates | Revert |
@@ -1,7 +1,17 @@
-Acronym for __J__oint __P__icture
__E__experts
__G__roup.
+[
Acronym]
for __J__oint __P__hotographic
__E__xperts
__G__roup.
-An
image file format
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 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].
+
+Like many ISO standards, you have to pay to get a copy of them.
+
+'Standard' JPEG uses lossy compression (Discrete Cosine Transform and quantisation) to significantly reduce file size while maintaining an acceptable image quality.
+
+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/.
