Search Results for "bit"

...For instance, compared to the fastest mode of zlib, Snappy is an order of magnitude faster for most inputs, but the resulting compressed files are anywhere from 20% to 100% bigger. Snappy is intended to be fast. On a single core of a Core i7 processor in 64-bit mode, it compresses at about 250 MB/sec or more and decompresses at about 500 MB/sec or more. (These numbers are for the slowest inputs in our benchmark suite; others are much faster.) In our tests, Snappy usually is faster than algorithms in the same class (e.g. LZO, LZF, QuickLZ, etc.) while achieving comparable compression ratios.

Crunch is an image compression tool for lossy PNG image file optimization. Using a combination of selective bit depth, color palette reduction and color type, as well as zopfli DEFLATE compression algorithm encoding that employs the pngquant and zopflipng PNG optimization tools, Crunch is effectively able to optimize and compress images with minimal decrease in image quality. While it may produce file size gains larger than those produced by lossless approaches, the impact on image quality is often imperceptible, and optimized file sizes are still significantly lower than the original.

...Lepton achieves a 22% savings reduction for existing JPEG images, by predicting coefficients in JPEG blocks and feeding those predictions as context into an arithmetic coder. Lepton preserves the original file bit-for-bit perfectly. It compresses JPEG files at a rate of 5 megabytes per second and decodes them back to the original bits at 15 megabytes per second, securely, deterministically, and in under 24 megabytes of memory. We have used Lepton to encode 16 billion images saved to Dropbox, and are rapidly recoding our older images. Lepton has already saved Dropbox multiple petabytes of space. ...

Multi-threaded HDF5 filter implementing the LPC-Rice codec. This lossless codec is intended to compress correlated signal data, such as image data, stored in HDF5 chunks. The codec/filter is optimized for both compression and decompression speed, but compression ratios are still comparable to JPEG-LS and CCSDS-123 codecs.

wcrush aka Crush for Windows was developed as a replacement for Taboo's crush.exe levelpacker, a cross platform tool allowing the use of faster PCs to compress Commodore 64 executables, which unfortunately doesn't work on modern Windows incarnations as e.g. Win8.1 64 bit due to its age. wcrush should work on all Windows versions since 98SE and can possibly be compiled to work under Linux and whatnot, too.

Implementation of the LZW algorithm in C#, adhering to the built-in System.IO.Compression. The algorithm and code is much improved, compared to projects like SharpLZW. The LZW algorithm is for arbitrary lossless data compression and are noticeable for simplicity and low (compared to others) memory consumption. Making it interesting for eg. embedded use. There're many other LZW implementations out there. This one is focused on KISS and C#.

hufc is a utility to compress or expand files using Huffman coding. It can use a 16-bit CRC or the IP checksum for error detection.

...ZipBackup focuses on providing simple file backup in an open, common file format instead of a proprietary format that locks you into a particular backup software. Full and incremental backups are automatically provided. ZipBackup also supports 256-bit Advanced Encryption Standard (AES) security for your zip files - the same security used by the NSA for classified information. With both compression and encryption, this combination makes ZipBackup an ideal tool for storing backups offsite on systems such as DropBox or Google Drive. ZipBackup also provides a restoration panel where you can view and retrieve your previous backups. ...

Windows 32 bit exe and dll packer

Fast and efficient proprietary bit reordering compression. Usefull for compressing binary-text files. Uses binary vectors reordering and dynamic data dictionary. (http://www.jasenko.com.mk)

A Compression Utility - based on own bit algorithm

New compression method based on bit repacking.