Gourt > Computers > Software > Data Compression
In computer science and information theory, data compression or source coding is the process of encoding information using fewer bits (or other information-bearing units) than an unencoded representation would use through use of specific encoding schemes. For example, this article could be encoded with fewer bits if we accept the convention that the word "compression" be encoded as "comp". One popular instance of compression that many computer users are familiar with is the ZIP file format, which, as well as providing compression, acts as an archiver, storing many files in a single output file.
As is the case with any form of communication, compressed data communication only works when both the sender and receiver of the information understand the encoding scheme. For example, this text makes sense only if the receiver understands that it is intended to be interpreted as characters representing the English language. Similarly, compressed data can only be understood if the decoding method is known by the receiver. Some compression algorithms exploit this property in order to encrypt data during the compression process so that decompression can only be achieved by an authorized party (eg. through the use of a password).
Compression is possible because most real-world data has statistical redundancy. For example, the letter 'e' is much more common in English text than the letter 'z', and the probability that the letter 'q' will be followed by the letter 'z' is rather small. Lossless compression algorithms usually exploit statistical redundancy in such a way as to represent the sender's data more concisely, but nevertheless perfectly.
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Compression Algorithms
Data Compression
Software :: Products and Tools
Compression :: Components
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1StepUnzip - Easy to use shareware tool for unzipping and installing your downloaded Internet files.
Meta Description: [ Unzip Files, unzip utility, zip files ]
7-Zip - Command-line and Windows shell utility for manipulating ZIP archives. Supported formats: ZIP, CAB, RAR, GZIP and TAR.
Archive Comparison Test - A set of benchmarks designed to show the state of the art in lossless data compression, by Jeff Gilchrist.
Meta Description: [ Archive Comparison Test (ACT) 2.0 is a set of benchmarks designed to show the state of the art in lossless data compression. ]
Automatic File Archiver by JSPayne - Does automatic archiving and backup of recently modified.
Meta Description: [ Utility to generate .CPL files and Icons for Windows control panel., Automatic file archiving ]
BitJazz Inc. - Lossless compression for photoquality images. Cross-platform. SDK. Free reader.
Meta Description: [ SheerVideo is the world's fastest codec, saving time, space, and money for pro video, with perfect fidelity. SheerVideo encodes 50 times faster than any other perfect-fidelity QuickTime codec for real-world footage, and supports RGB[A] and Y'CbCr[A], 10b and 8b, 4:4:4[:4] and 4:2:2. A free reader... ]
Cabextract - Portable UNIX decompressor for the Microsoft Cabinet (.CAB) format.
Meta Description: [ Support site for Stuart Caie's work ]
CAM Development - CAM UnZip - Free zip file utility, which allows you to quickly, open, create, and modify ZIP archives. In addition, CAM Unzip supports password protection, and can run an archive's Setup file automatically after it is unzipped.
CoffeeCup Free Zip Wizard - Free Zip/Unzip utility. CoffeeCup Free Zip Wizard has built-in E-mail and FTP functions, so you can Zip and send your files in one easy step.
Meta Description: [ Download the Free Trial Version of the CoffeeCup Free Zip Today. The Only Zip Software with Free Live Chat Support & Upgrades for Life. ]
ExpressZIP - ZIP and UNZIP Management complete with built-in Wizards to walk you through creating ZIP and EXE (self extracting) archives.
Meta Description: [ ExpressZIP features all of the powerful ZIP tools you'll ever need in an easy to use and attractive interface and comes complete with built-in Wizards to walk you through creating ZIP and EXE (self extracting) archives. ]
FilZip 2000 - Free application to handle a variety of archive file formats, including .ace, .arc. arj, .cab, .gz, .lha, .jar, .rar, .tar and of course .zip. (Win 9x/NT/2000/Me)
FlyZip - Elegant Algorithms - New patent pending data compression methods. FlyZip XR data compression utility for Palm OS.
GZIPSite Website Compression - Tool that can help you make static HTML websites run 50% faster and save 50-80% of the bandwidth.
Meta Description: [ Software development ]
Hifn Inc. - Designs, develops, and markets compression processors, encryption/compression processors, and software which provide alternatives for the implementation of high performance networks and tape storage devices. (Nasdaq: HIFN).
Meta Description: [ Hifn supplies today's most advanced compression, encryption, and classification technologies. Intelligent Secure Networking - Advanced silicon and software solutions for intelligent secure networks. ]
JET-Software - Software house in Germany, with compression products for mainframe, midrange and mini systems.
Meta Description: [ JET-Software, a software house in Germany, with products for mainframe, midrange and mini systems. ]
Maximum Compression - Aims to show the maximum achievable compression ratio for several filetypes (text, executable). The best 80-100 programs for every filetype are shown in a table indicating compression ratio and switches/options used to achieve that compression.
Meta Description: [ Maximum compression features benchmarks designed to show/test the best lossless data compression software/programs. ]
Official RAR archiver site - Downloads, Support, Tips, Tricks and Tools. The RAR format, like the other newer formats (bZip, and SIT) compresses files better than the popular, but older Zip algorithm.
Meta Description: [ ROG GmbH specializes in business
continuity planning, contingency planning and risk management and analysis.
ROG solutions and consulting services help you develop disaster
recovery plans. ]
QccPack - Quantization, Compression, and Coding Library. C source code freely available.
Meta Description: [ An open-source collection of library routines and utility programs for
quantization, compression, and coding of data. Includes routines for
entropy coding, scalar quantization, vector quantization, and
wavelet transforms. Includes open-source implementations of several
image-compression algorithm... ]
QuikCAT Technologies - Specializing in data compression software technologies for wireless transmission, Internet acceleration, Microsoft Exchange and Lotus Notes E-mail acceleration, and PDA video conferencing, using cellular automata transforms.
RAR/WinRAR support site - A support site for RAR and WinRAR archivers.
Meta Description: [ WinRAR provides the full RAR and ZIP file support, can decompress CAB, GZIP, ACE and other archive formats ]
Rarissimo - Companion tool for WinRAR for preserving NTFS alternate streams.
Meta Description: [ Automates compression scanning files with NTFS streams candidate to an ftp send, compressing with normalized filenames to a target folder and restoring Macintosh structures, filenames and Windows 2000 files properties after reception ]
RARReg - Offers downloads, support forums and registration for RAR compression tools.
Meta Description: [ WinRAR Archiver Registration Site ]
RemoteZip Zip File Manager - A ZIP File Manager that runs on a Web server and has a browser based interface.
Meta Description: [ The ZIP file compression system and ASP component specialists, utility software, development, Intranet and Web page design. Plus technical authoring and other services ]
RICAZip from CAPTEC - High performance lossless image compression applications, utilities and libraries.
SHCODEC - A efficient static huffman coder. The package contains source code, test program and documentation..
Meta Description: [ Fast and efficient static huffman codec (freeware) ]
Smacker Video Technology - A compressor for video, animation and sound data includes video compression with twice the video quality and now uses the Bink audio codec for perceptually lossless 8 to 1 compression.
SolutionSoft Systems, Inc. - E-Space, compression software for online archiving and disk space management.
Meta Description: [ Online Archiving, warehousing, data, management, disk, space, backup, storage management, HSM, FTP, GDS-2, GDS-II, MEBES, Download, demo, compression, compressors, optimization, intelligent, Solution, Chip design, software, Archive, backup, HSM, transfer, data, storage, files, over, WAN, LAN, int... ]
Spirit Corp - Offers MP3 codecs and voice compression algorithms.
Tomeraidit - Creates compressed TomeRaider files, allows unsurpassed text compression (45%-60%), plus TR files are portable between platforms of Windows, PDA (palm, pocket PC or psion)
Meta Description: [ Tomeraidit - the Tomeraider Pre-processor helps to convert HTML, files, folders and offline websites to compressed Tomeraider format ]
USENET Compression FAQ - This URL takes you to a compression FAQ that explains compression to technical people as well as describing the various programs, and what they do to users.
Video Compression Components - Third-party video compression software components for programmers.
Meta Description: [ Discover the benefits of using third party components for your next VB .NET or Delphi development project. If you're a product manager, then you know about project deadlines and coding until midnight. But did you know that there are solutions available to you in the form of third-party components... ]
WarpZip - Data compression utility for the OS/2 family of operating systems. Extensive drag and drop implementation and speech enabled utility that deals with zip and OS/2 packed archive formats.
Meta Description: [ Home of the Enhanced E Editor, ShowTime/2, WarpZip and the SFX Installer for OS/2 Warp ]
WinAce - Relative new though already used on many sites. When compared to WinZip the most important advantage of WinAce is better compression.
WinRAR - deutsche Download- und Supportsite - German site for WinRar.
Meta Description: [ official RAR / WinRAR - Registration Site; download, support and tools for RAR and winRAR; online registration - WinRAR is a powerful archive manager. You may use it to backup your data and reduce the size of email attachments, decompress rar, zip and other files downloaded from the Internet and ... ]
WinZip - WinZip is a windows data compression utility that focuses on the Zip data compression format for windows users. It took the lead from PKZIP when windows was introduced.
Meta Description: [ WinZip is the most popular compression utility for Windows. Easily zip and unzip files and folders. Use advanced AES encryption to protect sensitive data. ]
WinZip Splitter - Split and rejoin WinZip(R) archives for e-mail transmission in two mouse clicks.
x-PRESS - Delivers cross-platform data compression for data transfer, archiving, and retrieval.Part of the CoSORT family of sort and data manipulation solutions.
Meta Description: [ x-PRESS compresses and decompresses very large files dramatically and rapidly across mainframe, UNIX and Windows platforms. ]
Xceed Software Inc. - Makers of Zip and Unzip data compression controls for Windows developers that use ActiveX, OCX, VBX and DLLs.
Meta Description: [ Xceed develops high-quality compression, encryption and internet ActiveX and Microsoft .NET components. ]
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XMill - Compressor for XML data, available as source code and binaries for Windows and Linux. [Freeware]
ZBit Inc. - COM objects to Zip and Unzip files.
Meta Description: [ ZBit Inc. is the honest software development site. Instant purchase of world famous compression components and web chat software and many other ASP and ASP.NET solutions. ]
ZipALot - Takes all the ZIP archives from one directory and extracts them to another one, allows you to handle more than one ZIP archive at once. Free open-source software for Win32.
Zipbit - Works with popular archive types and has skin support.
Meta Description: [ Zipbit Home - most skinnable data compression (archive) utility for Windows.Zip your files beautifuly ]
ZipMail - Compression for Lotus Notes, that automatically compresses attached files into ZIP files or self-extracting files. Features full integration with the Lotus Notes email client software.
Meta Description: [ Compression and Optimization for Lotus Notes and Domino - ZipMail and other Solutions ]
Zipsearch - Zipsearch is shareware to search compressed zip archives for files inside archives. The program finds text strings within the files for viewing and changes.
Meta Description: [ Zipsearch can be used to locate files with matching searchstrings and find files on your system.Search archives and compressed files with zipsearch. We search files on computers. ]
zlib - A massively spiffy yet delicately unobtrusive compression library.
Zzip - A compression tool under GPL. Zzip compression algorithm is mainly based on the Burrows-Wheeler Transform method developped by Mike Burrows and David Wheeler.
Meta Description: [ zzip, a new powerful compressor under GPL, with very high compression ratio ]
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