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Dougmerritt (talk | contribs) qualified absolute statement: from it IS irreversible to "when the conversion is irreversible" |
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</ref> or to convert incompatible or obsolete data to a better-supported or modern format.
In the analog video world, transcoding can be performed just while files are being searched, as well as for presentation. For example, [[Cineon]] and [[DPX]] files have been widely used as a common format for [[digital cinema]], but the data size of a two-hour movie is about 8 [[Byte|terabytes]] (TB).<ref name=SMP/> That large size can increase the cost and difficulty of handling movie files. However, transcoding into a [[JPEG2000]] lossless format has better compression performance than other lossless coding technologies, and in many cases, JPEG2000 can compress images to half-size.<ref name=SMP/>
Transcoding is commonly a [[lossy compression|lossy process]], introducing [[generation loss]]; however, transcoding can be lossless if the output is either losslessly compressed or uncompressed.<ref name=SMP/> The process of transcoding into a lossy format introduces varying degrees of [[generation loss]], while the transcoding from lossy to lossless or uncompressed is technically a lossless conversion because no information is lost; however, when the conversion is irreversible, it is then more correctly known as ''destructive''.
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