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This topic comprises 2 pages: 1 2
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Author
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Topic: The Wizard of Oz (1939) IMAX 3D REISSUE
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Connor Wilson
Expert Film Handler
Posts: 190
From: Sterling, VA, USA
Registered: Jan 2011
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posted 09-25-2013 08:00 PM
quote: Joe Redifer
I don't think any IMAX locations are 4K yet that I know of. So why would they supply a resolution that they can't play? All IMAX locations using digital have aliasing that you can notice probably all the way to the near back of the auditorium if your eyeballs are good enough. Sit close to the screen and it looks like a preshow projector. Digital IMAX is really, really bad.
You have a good point! If you're going to install digital theaters with huge screens, go for at least 4K! Aliasing takes me out of the movie. Sadly, at the back section of rows at Tyson's IMAX, there is a thick walkway between the middle and back sections, making the back area way back. This sucks because you can't see what's on the bottom of the screen. It's fine for 2.35:1 films but totally unacceptable for everything else! I guess I'll sit more towards the front. As for artifacts, even a 15/70 print of Mission Impossible: Ghost Protocol had aliasing.
But Joe, what I saw wasn't the typical D-IMAX aliasing. It was the worst aliasing I have ever come across. The amount of it was sickening, but it was mostly prominent in the opening, thankfully.
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 09-27-2013 12:49 PM
quote: Connor Wilson
Sadly, at the back section of rows at Tyson's IMAX, there is a thick walkway between the middle and back sections, making the back area way back. This sucks because you can't see what's on the bottom of the screen.
It's just plain unbelievable that IMAX dares to deliver such crappy theater design as of today. A venue close to me also suffers a similar issue, no matter were you sit, if somebody tall sits in front of you, your view of the bottom part of the screen is ruined... If this would be a venue from the stone age, I could at least have some sympathy, but most of those venues are just brand new (as in, just recently converted).
A 4K 3D DCP would definitely not be DCI compliant, as it would exceed the allowed bitrate.
But, IMAX doesn't need to conform to DCI and IMAX is known to deliver 4K DCPs to their exhibitors in the past (at least they were labeled as such).
I've often seen the bad kind of scaling Joe refers to, that's easily noticeable in horizontal and/or vertical lines running trough the shot. The effect especially noticeable when the camera slowly zooms or pans.
I've not yet seen this in any D-IMAX setup in that way and with all the "custom" image processing going on, I would hope that they at least managed to get rid of those ugly beginners scaling artifacts. Actually I hope they limit scaling and other image deformations to an absolute minimum, given the limited resolution they have to work with.
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