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compress picture

Comprehensive Analysis

1) "Compress" -- As to compress picture 1com·press Pronunciation: k&m-'pres Function: verb Etymology: Middle English, from Late Latin compressare to press hard, frequentative of Latin comprimere to compress, from com- + premere to press -- more at PRESS transitive verb 1 : to press or squeeze together 2 : to reduce in size, quantity, or volume as if by squeezing <compress a computer file> intransitive verb : to undergo compression synonym see CONTRACT Pronunciation Symbols For other uses, see Compression. compress is a UNIX compression program based on the LZC compression method, which is an LZW implementation using variable size pointers as in LZ78. 1 Description of program 2 'compress' for Mac OS X 3 See also 4 External links 5 References Files compressed by compress are typically given the extension .Z. Most tar programs will pipe their data through compress when given the command line option -Z (tar in itself does no compress, it just stores multiple files within one tape archive file). Files can be returned to their original state using uncompress. The usual action of the program is not to create an uncompressed copy of the file, but to uncompress the compressed file (so that the uncompressed version retains the timestamp and other attributes of the compressed file). The LZW algorithm used in compress was being patented by Sperry Research Center in 1983. The person who applied for the patent published an IEEE article on the algorithm in 1984 [1], without mentioning that the algorithm was patent pending. Spencer Thomas took this article and implemented compress in 1984, without realizing that the LZW algorithm was patent pending (The GIF image format also incorporated LZW compression in this way and later Unisys claimed royalties on implementations of GIF). The patent on LZW compression was granted in 1985 and that is why compress could not be used without paying royalties to Sperry Research (which became Unisys). compress has fallen out of favor in particular user-groups because of the UNISYS and IBM patents covering the LZW algorithm it makes use of – be..." 2) "Picture" -- As to compress picture 1pic·ture Pronunciation: 'pik-ch&r Function: noun Etymology: Middle English, from Latin pictura, from pictus, past participle of pingere to paint -- more at PAINT 1 : a design or representation made by various means (as painting, drawing, or photography) 2 a : a description so vivid or graphic as to suggest a mental image or give an accurate idea of something <the book gives a detailed picture of what is happening> b : a mental image 3 : IMAGE, COPY <he was the picture of his father> <she was the very picture of health> 4 a : a transitory visible image or reproduction b : MOTION PICTURE c plural : MOVIES 5 : TABLEAU 2 6 : SITUATION <took a hard look at his financial picture> Pronunciation Symbols For movies, see Film. For other uses of Image, see Image (disambiguation). For image policy on Wikipedia, see Wikipedia:Images. In common usage, an image (from Latin imago) or picture is an artifact that reproduces the likeness of some subject—usually a physical object or a person. Images may be two dimensional, such as a photograph, or three dimensional such as in a statue. They are typically produced by optical devices—such as a cameras, mirrors, lenses, telescopes, microscopes, etc. and natural objects and phenomena, such as the human eye or water surfaces. The word image is also used in the broader sense of any two-dimensional figure such as a map, a graph, a pie chart, or an abstract painting. In this wider sense, images can also be produced manually, such as by drawing, painting, carving, by computer graphics technology, or a combination of the two, especially in a pseudo-photograph. A volatile image is one that exists only for a short period of time. This may be a reflection of an object by a mirror, a projection of a camera obscura, or a scene displayed on a cathode ray tube. A fixed image, also called a hardcopy, is one that has been recorded on a material object, such as paper or textile. A mental image exists in someone's mind: something one remembers or imagines. The subject of an image need not be real; it may be an abstract concept, such as a graph, function, or "imaginary" entity. For example, Sigmund Freud claimed to have dreamt purely in aural-images of dialogues. The development of synthetic acoustic technologies and the creation of sound art have led to a consideration of the possibilities of a sound-image comprised of irreducible phonic substance beyond linguistic or musicological analysis. 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