Pioneer BDP-LX91 - Manuel (Page 58)

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archives are also available via UUCP; contact [email protected] for information
on retrieving files that way.
Numerous Internet sites maintain copies of the UUNET files. However, only
ftp.uu.net is guaranteed to have the latest official version.
You can also obtain this software in DOS-compatible “zip” archive format from the
SimTel archives (ftp://ftp.simtel.net/pub/simtelnet/msdos/graphics/), or on
CompuServe in the Graphics Support forum (GO CIS:GRAPHSUP), library 12 JPEG
Tools. Again, these versions may sometimes lag behind the ftp.uu.net release.
The JPEG FAQ (Frequently Asked Questions) article is a useful source of general
information about JPEG. It is updated constantly and therefore is not included in
this distribution. The FAQ is posted every two weeks to Usenet newsgroups
comp.graphics.misc, news.answers, and other groups. It is available on the World
Wide Web at http://www.faqs.org/faqs/jpeg-faq/ and other news.answers archive
sites, including the official news.answers archive at rtfm.mit.edu: ftp://
rtfm.mit.edu/pub/usenet/news.answers/jpeg-faq/. If you don't have Web or FTP
access, send e-mail to [email protected] with body
send usenet/news.answers/jpeg-faq/part1
send usenet/news.answers/jpeg-faq/part2
RELATED SOFTWARE
Numerous viewing and image manipulation programs now support JPEG. (Quite a few
of them use this library to do so.) The JPEG FAQ described above lists some of the more
popular free and shareware viewers, and tells where to obtain them on Internet.
If you are on a Unix machine, we highly recommend Jef Poskanzer’s free
PBMPLUS software, which provides many useful operations on PPM-format image
files. In particular, it can convert PPM images to and from a wide range of other
formats, thus making cjpeg/djpeg considerably more useful. The latest version is
distributed by the NetPBM group, and is available from numerous sites, notably
ftp://wuarchive.wustl.edu/graphics/graphics/packages/NetPBM/. Unfortunately
PBMPLUS/NETPBM is not nearly as portable as the IJG software is; you are likely
to have difficulty making it work on any non-Unix machine.
A different free JPEG implementation, written by the PVRG group at Stanford, is available
from ftp://havefun.stanford.edu/pub/jpeg/. This program is designed for research and
experimentation rather than production use; it is slower, harder to use, and less portable
than the IJG code, but it is easier to read and modify. Also, the PVRG code supports
lossless JPEG, which we do not. (On the other hand, it doesn’t do progressive JPEG.)
FILE FORMAT WARS
Some JPEG programs produce files that are not compatible with our library. The
root of the problem is that the ISO JPEG committee failed to specify a concrete file
format. Some vendors “filled in the blanks” on their own, creating proprietary
formats that no one else could read. (For example, none of the early commercial
JPEG implementations for the Macintosh were able to exchange compressed files.)
The file format we have adopted is called JFIF (see REFERENCES). This format has
been agreed to by a number of major commercial JPEG vendors, and it has become
the de facto standard. JFIF is a minimal or “low end” representation. We
recommend the use of TIFF/JPEG (TIFF revision 6.0 as modified by TIFF Technical
Note #2) for “high end” applications that need to record a lot of additional data
about an image. TIFF/JPEG is fairly new and not yet widely supported, unfortunately.
The upcoming JPEG Part 3 standard defines a file format called SPIFF. SPIFF is
interoperable with JFIF, in the sense that most JFIF decoders should be able to read
the most common variant of SPIFF. SPIFF has some technical advantages over JFIF,
but its major claim to fame is simply that it is an official standard rather than an
informal one. At this point it is unclear whether SPIFF will supersede JFIF or whether
JFIF will remain the de-facto standard. IJG intends to support SPIFF once the standard
is frozen, but we have not decided whether it should become our default output format
or not. (In any case, our decoder will remain capable of reading JFIF indefinitely.)
Various proprietary file formats incorporating JPEG compression also exist. We
have little or no sympathy for the existence of these formats. Indeed, one of the
original reasons for developing this free software was to help force convergence on
common, open format standards for JPEG files. Don’t use a proprietary file format!
TO DO
The major thrust for v7 will probably be improvement of visual quality. The current
method for scaling the quantization tables is known not to be very good at low Q
values. We also intend to investigate block boundary smoothing, “poor man’s
variable quantization”, and other means of improving quality-vs-file-size
performance without sacrificing compatibility.
In future versions, we are considering supporting some of the upcoming JPEG Part
3 extensions --- principally, variable quantization and the SPIFF file format.
As always, speeding things up is of great interest.
Please send bug reports, offers of help, etc. to [email protected].
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