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This topic comprises 2 pages: 1 2
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Topic: More Star Wars B.S.
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 05-01-2002 10:37 AM
I suspect the "reported" 45-foot limit is mostly an issue of current DLP-Cinema projectors not having enough screen luminance (AFAIK, the goal is currently 12 footlamberts) on larger screens. Remember, a 60 x 25 foot "scope" image requires almost TWICE the light of a 45 x 18.75 foot image. Many theatres have screens larger than 45 feet wide.Bob Maar: I watched the Digital Cinema presentation of "Star Wars Episode 1: The Phantom Menace" several times each at both the Paramus NJ and Secaucus NJ theatres. I recall new screens had been installed, along with "beefed up" sound systems, personally supervised by Tom Lipiec of Lucasfilm. At the time, they were using the high-capacity (400 GB?) Pluto Raid Array that had relatively "mild" compression. My issues with the DLP-Cinema image quality were mostly those of pixel visibility, "jaggies", color gamut, tone scale, and black level.
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John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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Scott Norwood
Film God
Posts: 8146
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99
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posted 05-01-2002 12:25 PM
As I understand it, 12fl with DLP is equivalent to 16fl with film. The reason for this is that 16fl. is measured with no film in the gate; since film base material (polyester, acetate, nitrate) is slightly less than clear, there is some light loss even when running "clear" film. With DLP, the screen brightness is measured while projecting "white" light, which is equivalent to "clear" film.Actually, the DLP presentations that I have seen have all been brighter than film projected at 16fl, which I suspect is partly a result of a lack of standards and partly a deliberate choice, since most people equate "brighter" with "better" (as with sound, where "louder" is usually thought to be "better").
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 05-01-2002 12:40 PM
Ken asked: "I assume that when measuring the light with no film in the gate, you keep the projector running to a.) include the effects of the shutter when taking measurments and b.) avoid damage to the lens?"Yes. Standard SMPTE 196M specifies: "Measurement of the screen luminance shall be made with the projector in normal operation (with shutter running), with its lens set at the focus position, but with no film in the aperture." Even with the shutter running, with large lamps it is important to limit the time for "raw" radiant energy going through the lens, as some lenses may not be able to cope with the heat and be permanently damaged. In other words, take your measurements quickly, then let the lens cool before you do it again. ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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