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Author Topic: digital projection on a giant curved screen Jonathan Goeldner Phenomenal Film Handler Posts: 1360 From: Washington, District of Columbia Registered: Jun 2008 posted 06-16-2011 04:30 PM                     I've noticed on the Uptown screen here in DC that the image slightly bows at the corners of the curved screen with the new Christie dual projector 3D projector (this wasn't a problem with the 35mm/70mm projector) - apparently this is also an issue on the Arclight Cinerama dome screen. Granted there are not alot of screens that have such a degree of curvature - I gather from talking with the manager, and a couple of online sources the DCI specs don't have solutions to this problem - is this correct?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-16-2011 07:33 PM                     For 35mm, there have been special lenses for curved screens. Digital projectors feature universal zoom lenses for flat field. I think there is nothing in the DCI spec that disallows special lenses, if the image quality is not degraded. I doubt, however, that someone will make such lenses for a digital projector. All current DCI projectors only allow non-linear masking, but not non-linear image correction like curved distorsion. - Carsten  |  IP: Logged Paul Linfesty Phenomenal Film Handler Posts: 1383 From: Bakersfield, CA, USA Registered: Nov 1999 posted 06-16-2011 07:39 PM                     quote: Jonathan Goeldner apparently this is also an issue on the Arclight Cinerama dome screen. As it is with 35mm/70mm projection in the Dome.  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 07-17-2012 04:55 PM                 It has been 396 days since the last post.  |  IP: Logged Jonathan Goeldner Phenomenal Film Handler Posts: 1360 From: Washington, District of Columbia Registered: Jun 2008 posted 07-17-2012 04:55 PM                     according to "danstheday" over at Cinema Treasures, he's stated that there's talk about the curved screen at the Uptown Theater might being replaced by a flat screen - can't say that news is a good thing but it is a solution.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 07-18-2012 12:22 AM                     It's really a simple fix to rid of the 'frown' in the corners: All the operator/tech have to to is go into the program on the projector to adjust the default image settings to where the corners are lifted to compensate for the curved screen. Takes a minute to do this adjustment with a grid test pattern on the screen.  |  IP: Logged

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