Then how can the original Star Trek series be remastered in HD, as they are claiming? It was shot in 4:3. And if the original recordings are all in SD, how could it be changed to HD?
CBS plans first HD DVD release: Star Trek TOS - Engadget HD
I understand that many TV programs were shot on 35mm, including ST:TOS. And these are all candidates to be converted to 4:3 HD.
To quote from my previous post:
QUOTE There's no technical reason why there should not be 4:3 OAR HD programming if the programming is from film sources. Most movies prior to the early 50s were filmed in 4:3 aspect ratio, so you can do an HD transfer from these film sources and get HD resolution in 4:3, with sidebars. I am not sure how much of this is being done but we may see more of it in the future.
If the film has already been transferred to video than it will be SD source, then upconverted to HD resolution (but not HD quality) before transmission.
As my post said, you can get HD 4:3 if you convert it from a film source and that is what was done with ST. We may see more of this but it is a very expensive thing to do.
To quote from an article on the subject:
All 79 episodes of the original series (plus the two versions of the pilot episode The Cage) were given new fully-digital, high-definition film transfers. Ron supervised this effort himself, delving into the studio's vaults to use the original film interpositives for the process. The resulting D1 component digital master tapes were nearly perfect in terms of video quality, as anyone who saw them on SciFi can attest.