These are a bit of a marketing gimmick from the studios.
Basically the film is "mastered in 4K" but is then reduced down to 1080p (2K).
They are not proper 4K Blu-rays that need a special 4K player or a 4K screen.
A lot of films are already mastered in 4K and then reduced for Blu-ray, so this isn't as special as they make it sound. Basically they should have been mastered in 4K the first time they were released on Blu-ray, i.e. Ghostbusters, but weren't.
It's only worth buying these if the original Blu-ray wasn't from a 4K master.
Ghostbusters is the only one that I'd probably buy, as that actually looks a lot better than the original Blu-ray.
Glory looks quite nice as well.
Taxi Driver was originally mastered in 4K for its first Blu-ray release, so there wouldn't be any noticeable difference between that and the new "Mastered in 4K" release.
Here are some reviews, Mastered in 4K and Original Blu-ray, and have screen captures of both for you to compare (login to see them in full 1080p):
Mastered in 4K: https://www.blu-ray.com/movies/Ghostbusters-Blu-ray/69723/
Original Blu-ray: https://www.blu-ray.com/movies/Ghostbusters-Blu-ray/3661/
Mastered in 4K: https://www.blu-ray.com/movies/Glory-Blu-ray/69725/
Original Blu-ray: https://www.blu-ray.com/movies/Glory-Blu-ray/276/
Mastered in 4K: https://www.blu-ray.com/movies/Taxi-Driver-Blu-ray/69727/
Original Blu-ray: https://www.blu-ray.com/movies/Taxi-Driver-Blu-ray/1105/
PsychoCenobite
I watched some of the Spiderman footage on a 4K TV at Best Buy, and in all honesty, I was not impressed, just looked like a really good 1080P set.
I'm a big proponent of Video and Tech in general, and tend to be an early adopter, but this just did not seem to be the jump in clarity I was expecting.
It's too early for these sets to catch on anyway, as most people have only just recently made the step up to HD and are unwlling to shell out the money for an upgrade that wont even be available for broadcast for a very long time.
Can anyone answer me why they say 4K is 4times the resolution of 1080P when 4k is 3840x2160 and 2k is 1920x1080? That to me is double and not quadruple the resolution like they claim.
Was it true 4k material or was it the upscaled 1080P Blu Ray mastered from 4k? I bet it was the latter since everything I have read about 4k TV's has been very positive on the upgrade in PQ with true 4k material.
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