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7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives".It is developed by Igor Pavlov and was first released in 1999.
pngcrush is a free and open-source command-line utility for optimizing PNG image files. It reduces the size of the file losslessly – that is, the resulting "crushed" image will have the same quality as the source image.
The best image quality at a given compression rate (or bit rate) is the main goal of image compression, however, there are other important properties of image compression schemes: Scalability generally refers to a quality reduction achieved by manipulation of the bitstream or file (without decompression and re-compression).
Free Lossless Image Format (FLIF) is a lossless image format claiming to outperform PNG, lossless WebP, lossless BPG and lossless JPEG 2000 in terms of compression ratio on a variety of inputs. [ 4 ]
Name Creates [a] Modifies? [b]Mounts? [c]Writes/ Burns? [d]Extracts? [e]Input format [f] Output format [g] OS License; 7-Zip: Yes: No: No: No: Yes: CramFS, DMG, FAT ...
Maximum Compression, site benchmarking compressors for several filetypes (text, executable, jpeg etc.). Kingsley G. Morse Jr., "Compression Tools Compared", Linux Journal, issue 137, September 2005; Patrick Schmid, Achim Roos, (March 10, 2010) "Four Compression And Archiving Solutions Compared", Tom's Hardware
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