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  • Bijective BWT (7 Comments)

    David Scott has written a bijective BWT transform, which brings all the advantages of bijectiveness to BWT based compressors. Among other things, making BWT more suitable for compression-before-encryption and also give (slightly) better compression.

  • Asymmetric Binary System (113 Comments)

    Jarek Duda’s “Asymmetric Binary System” promises to be an alternate to arithmetic coding, having all the advantages, but being much simpler. Matt has coded a PAQ based compressor using ABS for back-end encoding. Update: Andrew Polar has written an alternate implementation of ABS.

  • Precomp: More Compression for your Compressed Files (3 Comments)

    So many of today’s files are already compressed (using old, outdated algorithms) that newer algorithms don’t even get a chance to touch them. Christian Schneider’s Precomp comes to rescue by undoing the harm.

  • On2 Technologies is Hiring

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  • China’s AVS Specifications Available (2 Comments)

    Its old news that China has developed their own Advanced Video Standard to avoid high licensing fees. English translation of the standard is now available, along with the IPR policy. Finally something technical that you can get your hands on to feed your appetite.

WinRK Archiver v2.1.3 beta released

Posted by Malcolm on 10th July 2005 | Permanent Link

WinRK v2.1.3 beta has just been released.
While this version contains many bug fixes, the biggest news is the improvements made to the PWCM codec plugin.
The PWCM algorithm has been optimised further for speed, allowing us to add more modelling and tune it for futher compression improvements. Along with some modifications made to the text filtering, this method now compresses significantly better, especially on large text data sets.

Also, in an attempt to investigate more practical uses for the underlying PAQ weighting technology, we have created some hybrid LZP/PWCM modes called FPW (Fast Paq Weighting). These modes try to trade off speed for compression ratio, providing four different speed levels.

Another feature of note was added to the Shell Extension. It now provides a property sheet for all handled archive types, displaying archive properties.

Please, download the new version today and enjoy all the new features!

4 Responses to “WinRK Archiver v2.1.3 beta released”

  1. Krisjohn Says:
    July 11th, 2005 at 7:58 pm

    I didn’t observe any significantly better compression in the test I just did (16 bytes difference). Any way to confirm that I’m definately using the right version of PWCM, with the right settings?

  2. Malcolm Says:
    July 11th, 2005 at 10:21 pm

    Take a look at the GIMP test at:
    http://studwww.ugent.be/~jdebock/gimp_source_compression_test.htm
    This gives an idea of the improvements that the new PWCM changes are capable of. Not all files will compress better, and there may be some that compress worse, but on average the compression has improved significantly (especially on large text sets), while the speed has improved slightly.
    The new PWCM plugin is v1.6 (check Settings|Plugins).

  3. Krisjohn Says:
    July 11th, 2005 at 11:22 pm

    Thanks, yup I’m using v1.6. Looks like TIFFs got no love this update. Maybe next one.

  4. The Data Compression News Blog » WinRK Archiver v2.1.5 released Says:
    August 1st, 2005 at 9:14 pm

    [...]

    WinRK archiver v2.1.5 has been released, which brings WinRK back out of beta testing. WinRK archiver is a state of the art file archiver, gaining some of the best compression currentl [...]

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