Loss of generation

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Losses of repetitively rotating and saving a JPEG image

The term generation loss denotes the increasing deterioration in quality from (copier) generation to generation.

Errors occur when making a copy . If you make a new copy of a copy that already has errors, the old error is propagated to the next copy (generation), and new errors can also arise.

These generation losses are a problem especially in the video and audio sector, because they occur there both in analog and digital dubbing, provided that data transfer protocols that do not correct errors and loss-free data compression (= data reduction , see also audio data compression ) are used.

Generation losses also occur with photocopies, which is why photocopies of photocopies should be avoided.

It becomes particularly problematic here if a file compressed by a lossy process is converted into another lossy format, i.e. transcoded (e.g. an MP3 file into an AAC file).

The same applies to the lossy JPEG image compression , where the quality of the image data is partially reduced if the image data is frequently decompressed, edited and compressed again.

In biology

In the context of evolution , this phenomenon is known as " mutation ".

literature

  • Gerald Fränkl: Digital Rights Management in Practice. VDM-Verlag Müller, 2005, ISBN 978-3-9367-55930 -.

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