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Topic: Cineplex to install digital 3-D - to combat piracy

Tristan Lane
Master Film Handler

Posts: 444
From: Nampa, Idaho
Registered: Feb 2002

posted 08-13-2007 11:39 PM

Here we go again with the POV argument. [uhoh]

I'd guess that 1/72 delay could occur between a set of IMAX SR projectors and no one would be able to tell. Even you. Since the automation is only looking at one projector's shaft encoder during a 3D presentation, the other projector may somehow be delayed due to whatever reason.....

Perhaps you should modify your "single projector 3D sucks" statement to something else since there are types of 3D that come from a single projector that you deem acceptable. The best example would be the IMAX GT projector since it is one unit, but projects the "Superior" 3D, even though it is still using linear polarization, or in some cases..... Shutter Glasses!! (Luxor anyone?) [scream]

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Mark J. Marshall
Film God

Posts: 3188
From: New Castle, DE, USA
Registered: Aug 2002

posted 08-14-2007 08:59 AM

My position is pretty clear. I'm sorry if you don't understand it, but I'll try to restate it more clearly one point at a time.

1. Projecting both eyes' frames in perfect sync is superior to alternating them in some fashion that offsets one eye from the other over some length of time. With current technology, this can only effectively be done with two projectors (either film or digital) running in perfect sync (even if the projectors are housed in one chassis and sit on one footprint on the floor, like IMAX projectors do).

2. Circular polarization is superior to linear polarization when used as a means to keep the eyes' images separated from each other.

3. Frames in perfect sync going through linear polarizers is superior to frames not in sync going through circular polarizers.

And for the record, yes I did notice a "frames out of sync problem" at the King Of Prussia IMAX theater during Superman. I wrote about it somewhere on this site, but I'm not sure where. I was supposed to find out what kind of projector they had, but I never got around to it.

God bless you if you don't notice the issue I'm talking about. It is quite annoying for those of us who see it. For me, the depth of the scene starts to flatten as well the more the images separate.

It's a shame I couldn't make it to the second 3D fest in LA. I would have liked to have seen the digital stuff they did with two projectors to see how it measured up. Judging from the quality of the shows at the first festival, I have a feeling it was top notch.

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