Old DVD Titles to BD Format: What Technology(ies)?

[Rush]

Many Classic, and not so classic, films are being re-released in BD format. I would like to know what technologies are being used to transfer the old material to the BD format. Are the producers going back to the original film material and "reshooting" the disk? Are they merely "upconverting" the old DVD disks? Etc.

I remember that when music CD's were new, many producers of the old, classic recordings were going back to the original analog session tapes and remixing the music to digital masters, from which the CD would then be pressed. Others were merely repressing the existing analog masters with various levels of enhancement. Also, many of the "better" jazz, rock and classical disks gave information about the source of the original material and some basic information about the conversion process(es) used. A few would give a fairly detailed technical discussion of the technology of the reproduction, focusing of course on how their specific approach enhanced the material to get the best digital reproduction as possible on the disk.

Are any of the BD disks being published with this kind of information available? Or, is it out there to be discovered, and, if so, how does one go about getting to it?

For example, I'd be interested in getting a BD disk of Gone With the Wind, and it could be extraordinary. A few years ago, this film was completely refurbished and a very good DVD released. If I were to find a BD release of this film, I would also be very interested in knowing the technology employed to produce the new release and how that technology could be expected to render an excellent HD viewing experience and how it may not give what the same film would have given if recorded in the most modern film technology designed with HD disk production in mind.

Also, does anyone know of any general discussions of these topics that are available online or elsewhere. As I suggested above, many new releases of old films in the BD format are coming, and I would like to be able to develop a bit of knowledge so that I can develop a sense of what to expect as I get into Blu-ray viewing on my new system.

Thanks for any info anyone may have on thiis area.