Compression artifact

A compression artifact is a noticeable distortion of media 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. If the compressor cannot store enough data in the compressed version, the result is a loss of quality, or introduction of artifacts.

The compression algorithm may not be intelligent enough to discriminate between distortions of little subjective importance and those objectionable to the user.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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