Manual Pioneer BDP-LX91 (page 58 of 72) (Dutch)

61667

Zoom out

Zoom in

1/72

Wallace article is copyright ACM and IEEE, and it may not be used for commercial

purposes.

A somewhat less technical, more leisurely introduction to JPEG can be found in The

Data Compression Book by Mark Nelson and Jean-loup Gailly, published by M&T

Books (New York), 2nd ed. 1996, ISBN 1-55851-434-1. This book provides good

explanations and example C code for a multitude of compression methods

including JPEG. It is an excellent source if you are comfortable reading C code but

don’t know much about data compression in general. The book’s JPEG sample

code is far from industrial-strength, but when you are ready to look at a full

implementation, you’ve got one here...

The best full description of JPEG is the textbook “JPEG Still Image Data

Compression Standard” by William B. Pennebaker and Joan L. Mitchell, published

by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1. Price US$59.95, 638 pp. The

book includes the complete text of the ISO JPEG standards (DIS 10918-1 and draft

DIS 10918-2). This is by far the most complete exposition of JPEG in existence, and

we highly recommend it.

The JPEG standard itself is not available electronically; you must order a paper copy

through ISO or ITU. (Unless you feel a need to own a certified official copy, we

recommend buying the Pennebaker and Mitchell book instead; it’s much cheaper

and includes a great deal of useful explanatory material.) In the USA, copies of the

standard may be ordered from ANSI Sales at (212) 642-4900, or from Global

Engineering Documents at (800) 854-7179. (ANSI doesn’t take credit card orders,

but Global does.) It’s not cheap: as of 1992, ANSI was charging $95 for Part 1 and

$47 for Part 2, plus 7% shipping/handling. The standard is divided into two parts,

Part 1 being the actual specification, while Part 2 covers compliance testing

methods. Part 1 is titled “Digital Compression and Coding of Continuous-tone Still

Images, Part 1: Requirements and guidelines” and has document numbers ISO/IEC

IS 10918-1, ITU-T T.81. Part 2 is titled “Digital Compression and Coding of

Continuous-tone Still Images, Part 2: Compliance testing” and has document

numbers ISO/IEC IS 10918-2, ITU-T T.83.

Some extensions to the original JPEG standard are defined in JPEG Part 3, a newer

ISO standard numbered ISO/IEC IS 10918-3 and ITU-T T.84. IJG currently does not

support any Part 3 extensions.

The JPEG standard does not specify all details of an interchangeable file format. For

the omitted details we follow the “JFIF” conventions, revision 1.02. A copy of the JFIF

spec is available from:

Literature Department

C-Cube Microsystems, Inc.

1778 McCarthy Blvd.

Milpitas, CA 95035

phone (408) 944-6300, fax (408) 944-6314

A PostScript version of this document is available by FTP at ftp://ftp.uu.net/

graphics/jpeg/jfif.ps.gz. There is also a plain text version at ftp://ftp.uu.net/graphics/

jpeg/jfif.txt.gz, but it is missing the figures.

The TIFF 6.0 file format specification can be obtained by FTP from ftp://ftp.sgi.com/

graphics/tiff/TIFF6.ps.gz. The JPEG incorporation scheme found in the TIFF 6.0 spec

of 3-June-92 has a number of serious problems. IJG does not recommend use of the

TIFF 6.0 design (TIFF Compression tag 6). Instead, we recommend the JPEG design

proposed by TIFF Technical Note #2 (Compression tag 7). Copies of this Note can

be obtained from ftp.sgi.com or from ftp://ftp.uu.net/graphics/jpeg/. It is expected

that the next revision of the TIFF spec will replace the 6.0 JPEG design with the

Note's design. Although IJG's own code does not support TIFF/JPEG, the free libtiff

library uses our library to implement TIFF/JPEG per the Note. libtiff is available from

ftp://ftp.sgi.com/graphics/tiff/.

ARCHIVE LOCATIONS

The “official” archive site for this software is ftp.uu.net (Internet address

192.48.96.9). The most recent released version can always be found there in

directory graphics/jpeg. This particular version will be archived as ftp://ftp.uu.net/

graphics/jpeg/jpegsrc.v6b.tar.gz. If you don’t have direct Internet access, UUNET’s

archives are also available via UUCP; contact help@uunet.uu.net 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 mail-server@rtfm.mit.edu 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 jpeg-info@uunet.uu.net.

 libupnp

Redistribution and use in source and binary forms, with or without modification, are

permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this list

of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice, this

list of conditions and the following disclaimer in the documentation and/or

other materials provided with the distribution.

* Neither name of Intel Corporation nor the names of its contributors may be

used to endorse or promote products derived from this software without

specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND

CONTRIBUTORS

“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR

CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED

TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR

Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

Forumrules

To achieve meaningful questions, we apply the following rules:

First, read the manual;
Check if your question has been asked previously;
Try to ask your question as clearly as possible;
Did you already try to solve the problem? Please mention this;
Is your problem solved by a visitor then let him/her know in this forum;
To give a response to a question or answer, do not use this form but click on the button 'reply to this question';
Your question will be posted here and emailed to our subscribers. Therefore, avoid filling in personal details.

new questions and answers
new manuals

You will receive an email to register for one or both of the options.

Get your user manual by e-mail

Enter your email address to receive the manual of Pioneer BDP-LX91 in the language / languages: Dutch as an attachment in your email.

The manual is 5,84 mb in size.

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.

Info

Pioneer BDP-LX91 Manual

Product: