Archive notice: This article was originally published on February 18, 2015. Links and embedded videos are preserved as part of the historical record.
It is explained using the HD version of the TV series “Cheers” and the Blu-ray remastering of “Ben-Hur”. Here is the complete answer: “Ask HTG: How Can Studios Release High-Definition Versions of Decades Old Movies and TV Shows?”
And here is another video from Gizmodo in which Criterion Collection shows how films are remastered.
GIZMODO – How Criterion Collection Brings Movies Back From the Dead from Gizmodo on Vimeo.
Here you can find the complete Gizmodo article on the subject.
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