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 - Internet FAQ Archives

comp.compression Frequently Asked Questions (part 1/3)
Section - [18] I need specs and source for TIFF and CCITT group 4 Fax

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

Top Document: comp.compression Frequently Asked Questions (part 1/3)
Previous Document: [17] What is the state of fractal compression?
Next Document: [19] What is JPEG?
See reader questions & answers on this topic! - Help others by sharing your knowledge

Specs for Group 3 and 4 image coding (group 3 is very similar to group 4)
are in CCITT (1988) volume VII fascicle VII.3. They are recommendations
T.4 and T.6 respectively. There is also an updated spec contained in 1992
recommendations T.1 to T.6.

CCITT (now ITU-T) specs are available by anonymous ftp (see above answer on
V.42bis).  The T.4 and T.6 specs are in

The following paper covers T.4, T.6 and JBIG:

  "Review of standards for electronic imaging for facsimile systems"
  in Journal of Electronic Imaging, Vol. 1, No. 1, pp. 5-21, January 1992.

Source code can be obtained as part of a TIFF toolkit - TIFF image
compression techniques for binary images include CCITT T.4 and T.6:

There is also a companion compressed tar file (v3.0pics.tar.Z) that
has sample TIFF image files. A draft of TIFF 6.0 is in
Concerning JPEG compression in TIFF 6.0, Tom Lane <> adds:

  TIFF 6.0's scheme for incorporating JPEG compression (spec section 22) has
  a bunch of serious deficiencies.  Don't use it.  A revised design is given
  by TIFF Technical Note #2,
  The revised design will replace section 22 in TIFF 7.0, and is implemented
  in Sam Leffler's libtiff.  See also item 75 of this FAQ for more JPEG info.

Software for reading and writing CCITT Group 3 and 4 images is
also available in directory
Contact: Alan Finlay <>.

See also question 54 below.

User Contributions:

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=]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.
Report this comment as inappropriate
Sep 19, 2021 @ 12:12 pm
Hey ... Im looking a man..
I love sex. Here are my erotic photos -

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

Top Document: comp.compression Frequently Asked Questions (part 1/3)
Previous Document: [17] What is the state of fractal compression?
Next Document: [19] What is JPEG?

Part1 - Part2 - Part3 - Single Page

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

Send corrections/additions to the FAQ Maintainer:

Last Update March 27 2014 @ 02:11 PM