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Topic: Do you need a silver screen for Spy Kids 3D ?
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Brian Michael Weidemann
Expert cat molester
Posts: 944
From: Costa Mesa, CA United States
Registered: Feb 2004
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posted 10-23-2005 03:10 AM
I never saw that movie, so I'm not sure how impressive the anaglyphic 3D effects can get, but I can be sure that prolonged viewing through those glasses would be MUCH worse on the eyes than a polarized system, which can allow for a full spectrum of color. Anaglyphic is, effectively, a monochrome display, isn't it? And denying each eye a different band of the visible spectrum from each other is something the brain will try to compensate for, before long.
A silver screen is, indeed, not a necessary part of that projection, though the image brightness would be noticeably stronger (at least from a straight on view).
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Monte L Fullmer
Film God
Posts: 8367
From: Nampa, Idaho, USA
Registered: Nov 2004
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posted 10-23-2005 03:59 AM
..on a side note of this topic above - being the release of "Shark Boy and Lava Girl-in 3D", by the same (New Line) company, and I saw this on a "silver high contrast" screen with the anaglyph glasses.
This presentation was far better on this silver screen due to the higher contrast than with the regular white screen when we picked the print up for discount runs.
Granted, silver screens are so directional as mentioned above-looking good when viewing from the center of the screen instead of on the side where the light reflects straight back. - just like projection TV's as they look good from the front, but view them on the side, you can't hardly see the screen.
It all depends on the light output if the bulb is new, or old and focused correctly for maximum output. If any of these factors are not played in accordance for 3D viewing, the presentation can suffer slightly.
In my carbon arc days, we had to replace the mirrors with the red transparent mirrors to really get the light out when we ran 3D with the polarized, split lens, and anaglyph variety-and we had the silver screen at our palace.
thx-Monte
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Stephen Furley
Film God
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 10-23-2005 05:10 AM
Where were you sitting? You will not get the best 3-D effect if you sit too close to the screen.
Polarised 3-D is superior to anaglyph, but anaglyph often looks much worse than it needs to.
If you close one eye then blacks on the screen should appear truely black, on a coloured background. The image for the other eye should be the same colour as the background, and therefore invisible. You need to repeat this with the other eye.
If the blacks appear coloured, or you can see a significant ghost of the image for the eye, then either the dye image on the print, on one or both of the filters is not fully absorbing in a the part of the sprectrum where they should be. In my experience I would say this applies to about 90% of anaglyph shows.
Polaroid needs much more than just a polariser at the projector; it also requires, depending on the system in use, either two syncronised, and correctly aligned projectors (there were places that did it with changeovers on four projectors, but that was rare, two projectors with 6000 foot spools was the norm) or an optical system to combine the two under and over or side by side images on a single strip of film. The side by side system, used for 1.37 ratio films, also requires an anamorphic lens. All of that results in a lot of light loss, so xenon wattage, or arc current, may well need to be increased, new lamps or bigger carbons, that in turm bay require upgraded rectifiers, and may have additional cooling implications.
Because the silver screen is highly directional you really need a fairly narrow auditorium, or if you have a wide, fan-shaped one you cannot sell the seats far off to the sides, as the picture will be too dim. It's also best not to use very large screens, especially with the single strip split frame systems; If you want a very large 3-D picture then you really need something bigger than 35mm. Fairly level projection is also desirable, not the very steep angle found in some older theatres. Lstly, you need some good projection staff, who will set everything up correctly, and keep it that way.
Doesn't apply today, but some 50s 3-D films, in their original release, had interlocked stereo magnetic sound, so you would also need a 35mm magnetic follower capable of taking 6000 foot spools.
A lot of theatres have run 3-D; relatively few of them have done it well. It is not something that a theatre should take on lightly; If they can't, or won't, do it well then it's best not to do it at all.
Did anyone see 'House of Wax' at the Lafayette yesterday? How did it look? I saw it at the NFT in London in a new two strip print getting on for ten years ago now; it looked much better than the single strip anamorphic re-release that I had seen previously. I never saw the original release with the stereo track.
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Frank Angel
Film God
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 10-27-2005 09:57 AM
Anaglyphic = Spawn of the devil. It is an abomination even when used on a B&W film.
The rods and cones of the retina and the brain combine to continually "white balance" what we see. If it didn't do that, we hardly ever see anything white -- outdoors a piece of white paper would look bluish; indoors under incandescent lighting, that same piece of paper would look yellowish; under fluorescent, the paper would look greenish. Basically we would see what color film sees when used under light that it is not configured for because without the proper filters, color film records the color as it actually IS, which varies greatly from light source to light source.
It is only because nature has built in active color correction that we perceive white as white under many different ambient color conditions (how thrilled Kodak would have been if it could offer film that did that!). Just put on a pair of pink sunglasses, or better yet, look thru a red gel for a few minutes, then remove it -- everything you see will have a heavy blue cast. That is because your natural color correction mechanism is causing the eye to fire the blue receptors more rapidly to shift your vision away from red to compensate for the red filter that you are looking thru. Use a blue or green filter and when you remove it, your vision will have a red cast to it. Again, your eye/brain has color shifted to compensate for the filter.
That all happens naturally; no problem. But in nature, your eyes do not have to ever compensate in totally opposite directions as has to be done when you place a red filter on one eye and a cyan on the other. The compensation here is going in two different, extreme directions. This WILL cause pain. For many people it does, and very quickly. It is no accident that Hollywood abandoned anaglyphic 3D in favor of polarized 3D, even with B& W films like CREATURE FROM THE BLACK LAGOON and IT CAME FROM OUTER SPACE where anaglyphic would have been much cheaper and more easily accomplished. It is also no accident that when the occasional "B" picture use anaglyphic 3D as a cheap gimmick, it only used it for brief periods of time, so as to avoid making the audience feel like their eyes and head were put in a garbage compactor. I have also been told by people who suffered thru our run of the DOUBLE BILL - 3hours -- of CREATURE and SPACE, it also can cause nausia. So anyone contemplating playing either of those two or, please no, both, be sure to hand out barf bags along with the glasses.
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