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- etimologia
O que (quem) é image compression - definição
Image compression
REDUCTION OF IMAGE SIZE TO SAVE STORAGE AND TRANSMISSION COSTS
Image Compression; Lossless image compression; Algorithms for image compression; Lossy image compression; Image file compression; Compressed image
Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other digital data.
Compression artifact
![Loss of edge clarity and tone "fuzziness" in heavy [[JPEG]] compression](https://commons.wikimedia.org/wiki/Special:FilePath/Sego lily cm-150.jpg?width=200 "Loss of edge clarity and tone \"fuzziness\" in heavy [[JPEG]] compression")
.png?width=200 "Block coding artifacts in a JPEG image. Flat blocks are caused by coarse quantization. Discontinuities at transform block boundaries are visible.")
NOTICEABLE DISTORTION OF MEDIA CAUSED BY THE APPLICATION OF LOSSY DATA COMPRESSION
Compression artefact; Compression artifacts; Block artifact; JPEG artifacts; JPEG artifact; Compression artefacts; JPEG compression artifacts; Mosquito noise; Datamoshing; Datamosh; JPEG artefacts; Mosquito artifact; JPEG artefact; Jpg artifacting; Jpeg artefacts; JPG artefacting; Lossy compression artefact; Lossy compression artifact; Data moshing; Video compression artifact; Image compression artifact; Artifact (compression)
A compression artifact (or artefact) is a noticeable distortion of media (including images, audio, and video) caused by the application of lossy compression. Lossy data compression involves discarding some of the media's data so that it becomes small enough to be stored within the desired disk space or transmitted (streamed) within the available bandwidth (known as the data rate or bit rate).
lossy
DATA COMPRESSION APPROACH THAT RESULTS IN LOSS OR CHANGE OF SOME DATA
Lossy; Lossy encoding; Lossy data compression; Data compression/lossy; List of lossy compression methods; Irreversible compression
<algorithm> A term describing a data compression algorithm
which actually reduces the amount of information in the data,
rather than just the number of bits used to represent that
information. The lost information is usually removed because
it is subjectively less important to the quality of the data
(usually an image or sound) or because it can be recovered
reasonably by interpolation from the remaining data.
MPEG and JPEG are examples of lossy compression
techniques.
Opposite: lossless.
(1995-03-29)
