Compression

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Compression

NAVIGATION

What is this compression format ?

Hi all,I've found in a file the sequence 78 9c ec bd that is starting acompressed stream.Any idea what could be the compression behing this magic number ?FYI this is on illustrator 12 file format (AI).The first char is a 'x' (78) and is maybe not part of the magic number,but the r...

6 answers | 402 bytes |

Large symbol sizes

"Alaric Snell-Pym" <alaric+usenet@snell-pymdotorgdotukwrote in messagenews:x-udnSGiWphGZHYRVnyvw@mailbox.co.uk--Most compression algorithm implementations seem to work with 8-bit bytesas a symbol, presumably out of a mix of tradition, convenience, andfocus on ASCII text.I'm interested in...

2 answers | 4266 bytes |

Select algoritm for shareware

I planing to write shareware like winzip or winrar. Please help me toselect algoritm. Thank you....

0 answers | 119 bytes |

A research paper monitoring service?

I wish to add a section at The Data Compression News Blog (www.c10n.info ) which can allow for easily monitoring any new researchpapers related to data compression. How to best go about doing this?arXiv and citeseer allow for automatic harvesting. Abstracts listingsof few IEEE journal's are...

2 answers | 1460 bytes |

XML-WRT 3.0 (a state-of-the-art XML compressor) has been released

XML-WRT 3.0 (XML compressor) has been released at:XML-WRT is a high-performance XML compressor. It transforms XML to morecompressible form and uses zlib (default), LZMA, PPMVC, or FastPAQ8 asback-end compressor. It is similar to XMill, but has many improvementslike e.g. semi-dynamic dictionary.b...

6 answers | 369 bytes |

Call for Papers: The IAENG International Conference on Computer Science (ICCS 2007)

CFP: IAENG International Conference on Computer Science ICCS 2007From: International Association of EngineersThe 2007 IAENG International Conference on Computer Science21-23 March, 2007, Hong KongThe conference ICCS'07 is held under the International MultiConferenceof Engineers and Computer...

0 answers | 7129 bytes |

A-B listen to the resultant difference between original audio andMp3 or other lossy file

Has anyone tried this before? What software would you use to do this?I'm wondering how to subtract an mp3 file from it's original WAV fileand hear what the resulting audio sounds like.I wonder also what the resultant C=(A-B)+A would sound like, where B isthe mp3 output of the original...

8 answers | 490 bytes |

Precomp - a command-line file precompressor

Hi!I wrote a command-line file precompressor named Precomp. Itdecompresses deflate/zLib streams in files (for example PDF, SWF, ZIP,JAR, PNG) and ensures they can be recompressed bit-to-bit-identical.The output file is larger, but can usually be compressed better thanthe original file with good...

14 answers | 764 bytes |

Hutter Prize submission: paq8hp4

I have posted test results for paq8hp4 by Alexander Ratushnyak onenwik8 for the Hutter prize (enwik9 to follow). This improves by1.000024% over paq8hp3, just over the 1% threshold required for theprize (500 euros per 1% improvement). The prize is structured so thata series of 1% improvements pay...

0 answers | 1995 bytes |

BTPC Extension - PyramidWorkshop 0.0.1

Today came the 0.0.1 of the Pyramidworkshop, I'm not going to write atrue ChangeLog as long as I don't hit feature-freeze (which then means0.1.0) or someone donates a 30 hour day. In the the 9 months after thelast version I didn't even spend one or two fulltime-weeks on this:I did...

1 answers | 2078 bytes |

YCbCr to RGB conversion

Hi allI am converting data from YCbCr to RGB UsingR= (Y + (1.4075 * (Cr - 127))) ))G=( (Y1 - (0.3455 * (Cb - 127) - (0.7169 * (Cr - 127)))) )B=( (Y1 + (1.7790 * (Cb - 127))) )But not getting the right colors like Yellow colors look very near tosafron.Please suggest some idea to recover from this...

1 answers | 397 bytes |

ace format

heyWanna know whether there is any free source code available forace decompression in C++ThnksSlayer...

0 answers | 143 bytes |