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Author Topic: Major studios in deal to convert to digital movie projection Mark J. Marshall Film God Posts: 3188 From: New Castle, DE, USA Registered: Aug 2002 posted 10-15-2008 05:27 PM                    quote: Mark Gulbrandsen Color wheel mounts in light path of projector... usually in front of integrator rod. Nothing to go askew. Can you elaborate a little on that, or point to a page that can? I'm still a little unclear on how the Dolby system works. It sounded like sort of an anaglyphic-type (color based) system originally. Although it sounded like the colors used were much easier on the eyes, which sounded kind of cool. Now it sounds like that's the case, except it's also field sequential in nature. Is that true?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-15-2008 06:01 PM                     Mark, I will get a few pics next week when I do the installs. Basically the color wheel mounts in the light path. The wheel is servo driven and refrenced to a signal available on all projectors GPIO port(at least something is standardized!). The wheel although it looks colored more closly resembles a lamphouse heat filter. The differeing sections divide the light into different left eye-right eye color frequencies and the DLP chips are normally triple flashed with a little bit of dark time to act as a buffer. The cool thing is Dolby's will actually work at three different flash frequencies... But it gives the least artifacts and headaches(none actually) at triple flash. Double flash is rarely done... only in some instances if one needs more light. The actual output light itself is measured with the aid of special test patterns and a calibrated set of filters similar to the filters in the glasses and color space ends up being precisely exact. The wheel automatically drops in or out of the light path as needed for 2-D or 3-D based on how your automation is set. BTW... There are something like 30 thin layers of coating on that glass wheel! The coatings themselves have to be very precisely layered for the actual system to work. Real-D material Ghost busted or not will also play back on the Dolby system just fine, but the Dolby doesn't require any ghost busting at all and since it is based on color frequency division the 3-D effect is exactly the same from every point in a given room. You can even stand right at the screen!! Mark  |  IP: Logged Brian Guckian Jedi Master Film Handler Posts: 594 From: Dublin, Ireland Registered: Apr 2003 posted 10-16-2008 10:25 AM                     An interesting footnote BTW is that whereas cost and handling issues with the glasses is seen as a problem right now, James Cameron and others have put forward the idea that people would buy their own glasses as a lifestyle accessory, much like a pair of expensive sunglasses. That gets over the cost issue as the item is then re-positioned as a personal accessory which one just brings to the cinema whenever one wants to see a 3-D title. Also bearing in mind the step-change advances that have been made on the production side that have established 3-D as a new story-telling medium in its own right - viz. changing the interocular distance as the equivalent of changing the focal plane in 2-D production, and manipulating the point of convergence to similarly allow the filmmaker to direct the audience's attention. IMHO a more legit artistic and commercial use for digital projection technology than trying to "replace" 35mm...and it's more or less self-financing as well  |  IP: Logged Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 10-16-2008 10:34 AM                        If the public doesn't tire of 3D and it does extend beyond the gimmick time-frame, theatres would be smart to sell the glasses as accessories in their lobbies. Smart manufacturers could produce "desiger" varieties so that they could be desirable in an of themselves. Could be nice money here. As an aside, I never could figure out why theatres didn't devote more of that lobby space into merchandising boutques -- all that stuff that specialty stores with movie themes could easily be sold by the theatres themselves.  |  IP: Logged

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