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HEARTH OF COMPRESSION By Nania Francesco Antonio. Best
resolution 1024x768. |
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DATA COMPRESSION In computer
science and information
theory, data
compression 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. Examples include the ZIP
file format (which
also acts as an archiver, storing many source files in a single
destination output file) and the gzip utility. As with any 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.Compression is useful because it helps reduce the
consumption of expensive resources, such as hard disk space or transmission bandwidth. On the downside, compressed data must
be decompressed to be used, and this extra processing may be detrimental to
some applications. For instance, a compression scheme for video may require
expensive hardware for the video to be decompressed fast enough to be viewed
as it's being decompressed (the option of decompressing the video in full
before watching it may be inconvenient, and requires storage space for the
decompressed video). The design of data compression schemes therefore
involves trade-offs among various factors, including the degree of
compression, the amount of distortion introduced (if using a lossy
compression scheme), and
the computational resources required to compress and uncompress the data. |
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MY PROGRAMS : FlashZIP
Archiver …… [Home Page] |
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WINTURTLE
1.6.0 |
Is very
powerfull ARCHIVER creator with
windows interface. He uses LZP+ARI compression for very good compression
ratio. It supports the BMP,EXE,WAVE compression with filters. Compress over
4GB of files size. Winturtle in action
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RINGS
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Is
impressive single file compressor based on fast BWT+ARI compression.
It supports the BMP,EXE,WAVE compression with filters. At moment
not support files > 4GB . v.1.5c Download…… v.1.6 Download…… [+
linux version ] |
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HOOK
1.4 |
Is very
powerfull single file compressor based on ADMC + LZP compression [ wikipedia ]. It supports the BMP,EXE,WAVE compression
with filters. At moment not support files > 4GB .
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Is very
powerfull single file compressor based on fast LZ77 compression.
It supports the BMP,EXE,WAVE compression with filters. At moment
support files > 4GB . v.0.90b Download…… [+ linux version ] v.0.91a Download…… |
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BZP LZC
SR3 |
My last
very good file and folder archiver based onf very faster LZP+ARI compression.
It supports the BMP,EXE,WAVE compression with filters. At moment
not support files > 4GB. Is
single file compressor based on LZC ( LZW type) compression. It supports
the BMP,EXE,WAVE compression with filters and source code included (Open
source) . At moment not support files > 4GB. Is a
free, open source (GPL) file compressor by Matt Mahoney modified (from SR2)
by Nania Francesco Antonio, Oct. 28, 2007. The context table size is
increased from 4 MB to 64 MB, which effectively increases the context from
order-4 to order-5. This helps compression on larger files, but makes it
worse for some smaller files. The program also detects file type. For .bmp
files, the order is decreased. For .wav files, the input is split into
separate 1 byte wide streams for each audio sample.
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MONSTER OF COMPRESSION [
Benchmark ] This data compression benchmark ranks lossless data compression programs by the compressed size for 1.061.420.156 bytes. It use five ranks………… |
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