Can Old Movies & TV Benefit From HD?
While it’s easy to expect new films to look great on Blu-ray what does surprise people is how old films, even those in black and white, can really shine in high definition. Admittedly this is affected by the quality of the original print, the time and expense spent on remastering, and the skill of the technicians involved. But with a bit of elbow grease, money, and a lot of love the stars of yesterday can sparkle just as brightly as those of tomorrow.
Warning: The following contains numbers and is just a tad bit geeky.
Like Standard Definition TV and DVD, High Definition is measured in lines. Films on Blu-ray have a resolution of 1920x1080. That is to say there are 1920 horizontal lines and 1080 vertical lines. Blu-ray is therefore capable of a resolution of just under 2K. Those good old DVDs only had a resolution of 480 lines. Film on the other hand isn’t measured in lines and technically doesn’t have resolution in the same way. However, to keep life simple you can say that 35mm film is roughly equivalent to anywhere between 4k and 6k. Right there you can see that film is capable of producing an image with a greater resolution than is available on the latest home technology.
In real simple terms this means that film is theoretically able to produce a better picture than that found on Blu-ray. But…
Before releasing an old film on Blu-ray a studio ‘should’ prepare a new version. This ideally involves having the original negative scanned in at 4K, or even at 6K. The highest number is desired to ensure the master can be used in the future when resolutions in home cinemas increase. However, as with anything, this can be expensive so studios sometimes don’t bother and only do a 2K version. The film then has to be examined frame by frame and any damage or dirt is removed. To some extent this can be done by computer (but can cause problems with over excessive DNR). The film may also need to be color corrected, as it could have faded or age may have played havoc with the original color balance. When this is completed a copy is then made at a lower resolution that is suitable for Blu-ray. As you can imagine all of this is time consuming and costly. So while films like Gone with the Wind are given the full treatment because the studio knows there will be a return on their investment, it’s unlikely that something like Arthur Askey’s Bees in Paradise would ever get the full VIP, 4K treatment.
Bear in mind the above has been simplified. There are many other complications that can be caused by the original negative being Technicolor, cinemascope, vistavision etc. It’s also hard to determine the correct color balance of a really old film when nobody is alive to remember what it originally looked like.
So what about TV? Well, I’m glad you asked.
In the world of TV there are even more complications. In the USA during the sixties a lot of TV enjoyed the luxury of being shot on 35mm film. That’s why the original series of Star Trek looks fantastic on Blu-ray. It has lush colors, it’s clear, sharp, and almost looks like it was shot yesterday. In the UK things were not as great. Classic shows from that period like Callan, The Sandbaggers and Dr. Who were made on the smallest budget possible. For Dr. Who this meant that the interiors were filmed using videotape and the exteriors were shot on 16mm film. They did this because videotape was cheap to record with (and reusable), but the cameras were too big and bulky to use on location so they would then switch to film. When watching an episode you can easily tell the difference between the two formats. Unfortunately neither videotape or 16mm film have a resolution that can provide the clarity that is required for Blu-ray.
So there you have it. Old films are capable of producing stunning images on modern projectors and TVs… Sometimes.
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