On Wed, 15 Jun 2005 16:38:13 +0200, Toralf Lund wrote:
> I'm not sure the traditional JPEG files support this kind of
> compression [lossless] even in theory.
According to my "Encyclopedia of Graphic File Formats" (Murray and van
Ryper, 1996) it did.
"The JPEG standard does offer a separate lossless mode.
This mode has nothing in common with the regular DCT-
[Discrete Cosine Transform] based algorithms, and it is
currently implemented only in a few commercial
applications." [page 200]
> It should perhaps be pointed out in this context that the file
> format commonly referred to as JPEG is more properly called
> JFIF (Jpeg File Interchange Format.) It seems like we are
> confusing each other more than necessary because we use the
> same name when describing the file format as well as when
> taliking about the compression scheme(s),
Maybe, but I doubt it. For all practical purposes today, the two are
synonymous to the people that don't know about the difference, and the
context informs the people who do know the difference.
TTYL, DougF KG4LMZ
