Search the FAQ Archives

3 - A - B - C - D - E - F - G - H - I - J - K - L - M
N - O - P - Q - R - S - T - U - V - W - X - Y - Z
faqs.org - Internet FAQ Archives

comp.compression Frequently Asked Questions (part 1/3)

( Part1 - Part2 - Part3 - Single Page )
[ Usenet FAQs | Web FAQs | Documents | RFC Index | Sex offenders ]

See reader questions & answers on this topic! - Help others by sharing your knowledge
                            It is insufficiently considered that 
                            men more often require to be reminded 
                            than informed.
                                                  Samuel Johnson


This file is part 1 of a set of Frequently Asked Questions (FAQ) for
the groups comp.compression and comp.compression.research.  If you
can't find part 2 or 3, see item 53 below. A copy of this FAQ is available
by ftp in ftp://rtfm.mit.edu/pub/usenet/news.answers/compression-faq/
files part1 to part3. This FAQ is also accessible in the World Wide Web at
http://www.faqs.org/faqs/compression-faq/part1/preamble.html or
http://www.cis.ohio-state.edu/hypertext/faq/usenet/compression-faq/top.html

Certain questions get asked time and again, and this is an attempt to
reduce the bandwidth taken up by these posts and their associated
replies.  If you have a question, *please* check this file before you
post.  It may save a lot of peoples time.

If you have not already read the overall Usenet introductory material
posted to "news.announce.newusers", please do. It is also available by
ftp in ftp://garbo.uwasa.fi/pc/doc-net/usenews.zip (see item 2 below
about .zip).

If you don't want to see this FAQ regularly, please add the subject
line to your kill file.  If you don't know what a kill file is, get by
ftp the file ftp://rtfm.mit.edu/pub/usenet/news.answers/killfile-faq
If you have corrections or suggestions for this FAQ, send them to
Jean-loup Gailly <jloup at gzip.org>. (Replace " at " with "@". This is
a protection against junk mail. Sorry for the inconvenience.)

Part 1 is oriented towards practical usage of compression programs.
Part 2 is more intended for people who want to know how compression works.
Part 3 is a long (but somewhat obsolete) list of image compression hardware.

Main changes relative to the previous version:

- LZO page moved [item 2]
- new url for the File Format Collection [items 2 & 54]
- new url for ACE [item 2]
- new pkzip version [item 3]
- fixed url for arithmetic coder [item 13]
- add url for DjVu, an image compression library [item 15]
- remove obsolete link [item 15]
- new url for DCT algorithms [item 15]
- add url for lossless image compression benchmarks [item 16]
- added urls for the MP3 audio compression standard, and for benchmarks
  of lossless audio compression programs [item 26]

Contents
========

General questions:

[1]  What are these newsgroups about?
[2]  What is this .xxx file type?
     Where can I find the corresponding compression program?
[3]  What is the latest pkzip version?
[4]  What is an archiver?
[5]  What is the best general purpose compression program?
[7]  Which books should I read?
[8]  What about patents on data compression algorithms?
[9]  Compression of random data (WEB, Gilbert and others)
[10] Fake compression programs (OWS, WIC)
[11] What is the V.42bis standard?
[12] I need source for the winners of the Dr Dobbs compression contest
[13] I need source for arithmetic coding

Image and audio compression:

[15] Where can I get image compression programs?
[16] What is the state of the art in lossless image compression?
[17] What is the state of fractal compression?
[18] I need specs and source for TIFF and CCITT group 4 Fax.
[19] What is JPEG?
[20] I am looking for source of an H.261/H.263 codec and MPEG
[25] Fast DCT (Discrete Cosine Transform) algorithms
[26] Are there algorithms and standards for audio compression?

Common problems:

[30] My archive is corrupted!
[31] pkunzip reports a CRC error!
[32] VMS zip is not compatible with pkzip!
[33] I have a problem with Stacker or DoubleSpace!

Questions which do not really belong to comp.compression:

[50] What is this 'tar' compression program?
[51] I need a CRC algorithm
[52] What about those people who continue to ask frequently asked questions?
[53] Where are FAQ lists archived?
[54] I need specs for graphics formats
[55] Where can I find Lenna and other images?
[56] I am looking for a message digest algorithm
[57] I have lost my password on a .zip file


Part 2: (Long) introductions to data compression techniques

[70] Introduction to data compression (long)
       Huffman and Related Compression Techniques
       Arithmetic Coding
       Substitutional Compressors
          The LZ78 family of compressors
          The LZ77 family of compressors

[71] Introduction to MPEG (long)
       What is MPEG?
       Does it have anything to do with JPEG?
       Then what's JBIG and MHEG?
       What has MPEG accomplished?
       So how does MPEG I work?
       What about the audio compression?
       So how much does it compress?
       What's phase II?
       When will all this be finished?
       How do I join MPEG?
       How do I get the documents, like the MPEG I draft?

[72] What is wavelet theory?
[73] What is the theoretical compression limit?
[74] Introduction to JBIG
[75] Introduction to JPEG
[76] What is Vector Quantization?
[77] Introduction to Fractal compression
[78] The Burrows-Wheeler block sorting algorithm


Part 3: (Long) list of image compression hardware

[85] Image compression hardware
[99] Acknowledgments


Search for "Subject: [#]" to get to question number # quickly. Some news
readers can also take advantage of the message digest format used here.

If you know very little about data compression, read question 70 in
part 2 first.

User Contributions:

1
Report this comment as inappropriate
Sep 23, 2019 @ 12:00 am
The Major Advantages of uniform dating

online dating services is not a newest platform but it has taken a sudden rise after the advancement in the technologies. This has revolutionised the way singles meet. With many struggles of dating in today sphere, More people these days are turning their heads towards the internet.

Even for arranged your marriage, Older dating and stuff like that, People are changing themselves and adopting the platform with all open heart and mind. Beside several advantages these platforms possess, Location and religion are the factors that set it apart. You can find your life partner from everywhere and out of any religion. These religions and castes barely matters when it comes to online dating sites.

really fast, Easy and convenient: At the first, Dating platforms might seem to be a daunting process, [url=https://charmdatescamreviews.wordpress.com/2018/03/19/charmdate-review-why-should-i-date-ukrainian-girls-how-charmdate-protects-me/]online dating ukraine[/url] But in real it is a simple and efficient process to register and connect with people all around the globe. The only thing you need to do is creating an eye catchy and appealing profile mentioning all needed details about you, Your hobbies and your fascinates. Its speedy and convenient access makes it a must have platform for those busy corporate out there.

Less pressing: This is one of the best platforms especially for the people who are shy or nervous as they can connect with people they find interesting via chats unless they get familiar enough with them to either have a verbal talk or start with dating in person. It gives you relaxed atmosphere, Where you can take out efficient time to think to understand and what you want to say to proceed ahead with the conversation.

Meet lots more people: This platform gives user a numerous choices to select from and also it is possible that you can connect with many people altogether and you can find sometimes a person who can be a great friend and a person who can be eligible to be your partner in the future time. This platform will allow you to pick the best one out of many with whom you think you can share your interests with.

add on a Deeper Level: This online site help you know a person back to front. The only appearance you have of your mate is his profile picture, Else you have to know it with the help of the chat you have with him. this can help you evaluate a person behind his face, numerous experts judge who these persons are truly are. Such dating platforms leave you unbiased to be love someone you share similar interests with.

Full Disclosure: The online dating sites allow you to specify whatever is your expectation and intention, Right right from the start so that you can find people looking for the same things and interests as of yours. The major benefit of all such platform is that it helps preventing misunderstandings and disappointments.

fee: Last but not the cheapest, Cost saving is the most appealing benefit of online dating because real life dates are expensive. You need to hangout with your partner every weekend and you further have to spend money either on food or night-life or both.

These platforms therefore gives you enable you to get to know the person well in advance through these online portals and thereafter you should spend money on real dates. different, On the very first meet even you must spend money with no surety that you will like the person as a partner or not.

Comment about this article, ask questions, or add new information about this topic:



Section Contents



Part1 - Part2 - Part3 - Single Page

[ Usenet FAQs | Web FAQs | Documents | RFC Index ]

Send corrections/additions to the FAQ Maintainer:
jloup@gzip.OmitThis.org





Last Update March 27 2014 @ 02:11 PM