Film-Tech Forum ARCHIVE: Digital Steadiness

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Topic: Digital Steadiness

Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 01-15-2002 02:15 PM

In Italy Multiplex Arcadia is the first theater equipped with a D-Cinema projector. It is a Barco on a Cinemeccanica consolle.
I dind't see the movie (Atlantis) but a friend of mine told me that after the movie he was under the screen where he saw the "pixels". He told me that those pixels was not staedy and that they was moving of about 2/3 centimeters.
How is it possibile? The cooling system?

Bye
Antonio

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 01-15-2002 02:55 PM

Antonio said: "He told me that those pixels was not staedy and that they was moving of about 2/3 centimeters.
How is it possibile? The cooling system?"

I suspect there was some vibration in the projector or optics. Those are very massive lenses hanging in front of the projector, and there are cooling fans and coolant recirculators. You still need to pay attention to the basics of projection for "Digital Done Right", just as you do for "Film Done Right".

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion

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Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 01-16-2002 04:34 AM

Thanks John

Antonio

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Ben Stephenson
Film Handler

Posts: 29
From: Manchester, England
Registered: Jan 2001

posted 01-25-2002 04:43 PM

We have a DLP and did have Alantis and now have Monsters Inc and had no problems at all. The image is very very good. But Alantis was a digital copy of a 35mm print.

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 01-25-2002 06:02 PM

Antonio said the pixels themselves were unsteady, which would likely be caused by projector vibration.

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Antonio Marcheselli
Phenomenal Film Handler

Posts: 1260
From: Florence, Italy
Registered: Mar 2000

posted 01-26-2002 07:29 AM

John

I didn't saw the movie, it is projected in a 600km far theater...

A friend of mine saw it and was unable to tell me if pixels were moving or just the image.

Bye
Antonio

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Richard Fowler
Film God

Posts: 2392
From: Ft. Lauderdale, FL, USA
Registered: Jun 2001

posted 01-26-2002 09:48 AM

The Barco D-Cine on a Cinemeccanica console should not vibrate if the tilt bolts and projector hanger mount are tight. Cinemeccanica consoles put the power supply on the floor support so it can not add to the mass to help dampen the weight of the very heavy & large anamorphics used for presentation.............
Richard Fowler
TVP-Theatre & Video Products Inc. www.tvpmiami.com

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Ben Stephenson
Film Handler

Posts: 29
From: Manchester, England
Registered: Jan 2001

posted 01-26-2002 09:56 AM

No moving parts on a DLP to cause image shake (well cooling fan and some other small moving parts) sounds like an internal falt, When we get DLP films the image is checked before the engineer leaves..i would have thought that this would be the same with all DLP instalations

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Owen Shave
Film Handler

Posts: 34
From: Manchester, UK
Registered: Feb 2002

posted 02-17-2002 07:44 PM

yeah... I watched Atlantis in DLP at our gaff, Ben and it was definately below par compared to the other DLP films we've had. Two thumbs up for DLP on the largest screen in Europe (just in time for episode II please

)
the screen is 21.24m by 9.04m... how does this compare internationally? our IMAX screen is only 5 metres wider.. but of course its twice as tall. Big is not necessarily beautiful.. focus is often slightly soft with films on this screen.

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99

posted 02-17-2002 07:47 PM

Larry Shaw are you out there????
If I remember correctly film has won out over D-cinema for steadiness every year at Showest. Can you verify this, or please, shoot me down.
Mark @ Home

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000

posted 02-18-2002 01:28 PM

Unsteadiness is usually NOT one of Digital Cinema's problems (except possibly due to any vibration of the equipment or optics).

Unsteadiness is NOT a problem with "Film Done Right" either. SMPTE Recommended Practice RP 105 specifies less than 0.12% "jump" and 0.20% "weave" for 35mm projection on "large appearing" screens. Proper lab procedures (i.e., always contact printing short pitch originals to long pitch raw stock, and using a pin-registered printer if you can't) and well-maintained projectors can achieve this level of steadiness.

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: 585-477-5325 Cell: 716-781-4036 Fax: 585-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion

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