TNG
Harvey wrote:

shot many of its visual effects on 35mm film. These shots would simply have to be rescanned and recomposited
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If Star Trek: The Next Generation is ever brought to HD, Paramount may elect to recreate all of the visual effects using modern CGI techniques. But they wouldn't have to.
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Harvey is correct in that it could be done if cost did not matter but it does matter.
#324
http://trekbbs.com/showpost.php?p=3590821&postcount=324
R.O.I.
It would not be cost effective to telecine all the Enterprise-D exterior model shots for compositing.
Any live-action ship interiors they would do the visual effects over the filmed footage.