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This topic comprises 2 pages: 1 2
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Author
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Topic: Almost transparent Blu-Ray disc
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Julio Roberto
Jedi Master Film Handler
Posts: 938
From: Madrid, Madrid, Spain
Registered: Oct 2008
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posted 06-22-2009 03:42 AM
Claude:
I guess you still haven't grasped the way DVD and Blu-ray work.
It would be a long and boring technical explanation, but, unlike LaserDiscs which were, in effect, a hybrid form of analog video (let's not get into subtle details), DVD's and Blu-ray's are not only digital, but encrypted and compressed.
In a few words this means: it's totally, completely, absolutely, mathematically IMPOSSIBLE for a blu-ray or DVD disc to produce anywhere near a coherent image that is not EXACTLY what the person that made the disc intended to produce, under any circunstances.
A "replication fault" could only yield to a movie with gross and obvious faults of the type of: A) Not playing at all B)Freezing the hell out of the picture C) Big chunks of incoherent blocks of stuff showing up.
But it's TOTALLY impossible to produce a more-or-less normal looking picture with some "subtle" faults, say off-colors or weird gamma. If it displays that way, the only MATHEMATICAL possibilities are: that's the way it should be (the way the manufacturer ok'ed the master) or the playback equipment is faulty/misscalibrated.
So every single copy of the blu-ray that you buy (from the same edition, of course) would look exactly the same. The DVD version that you have has been mastered separately, perhaps even from a different transfer, so you can not use it for comparison except to figure that whoever mastered the DVD either had access to better source material or did a better job than the (idiot) who transfered/mastered the blu-ray.
But there CAN'T be DVD or blu-ray discs with "subtle defects" from one copy to another. Simplifying: all DVD's look the same, and all BD discs look 100.00% the same NECESSARILY or, if defective, they "don't play at all or give huge obvious problems", but they can't ever give somewhat normal looking images with "imperfections".
And yes, the blu-ray discs can be made to look quite transparent and still read perfectly.
In this case, if you are not satisfied with the picture from that edition, all the replacement discs you get would produce the exact same result. Unless the manufacturer acknowledge the did a job and pressed a NEW DIFFERENT EDITION re-mastered (or re-transferred) to exchange them with.
But it's not (can't possibly be) a fault with your "one-off" disc. ALL the discs from that edition of the movie will be EXACTLY the same by mathematical need. Welcome to the wonderful world of digital.
Think of digital encryption like a safety box with a pristine (or shitty, that's up to the owner) photograph inside. You must read perfectly the combination to open safe's lock or, if you screw up even the slightliest number, the combination won't open the safe at all.
If the safe opens, the picture inside will be exaclty the picture the owner placed there. If a single one of the numbers is wrong, the safe doesn't open at all and you get no picture wathsoever. You can't get a "bad picture" or "partially defective picture" because you read one of the numbers of the combination wrong. The safe won't open at all in that case and you'll get no picture whatsoever. That's a way you could see digital encryption. And (virtually) all DVD and Blu-ray movies are digitally encrypted, so they must decrypt to 100.00% the exact "combination" or they can't be "opened" at all.
And then comes compression, yet another mathematical transformation the requires every single number to be 100% correct or the results won't make sense ...
With these digital formats you always get: 100% the data you put in there or ... an obviously very corrupt result. No in-between.
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