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Author Topic: Christie laser projector mis-registered? Jonathan Smiles Film Handler Posts: 11 From: Devon UK Registered: Jul 2001 posted 10-23-2019 09:37 AM                        Is mis-registration easily fixable on Christie laser projectors? Don't know model of projector but it will be a standard model for a 200 odd seat theater with stadium seating. It's a new plex with all laser projection and laser IMAX. Images such as white text have a red bottom edge and green top edge and it's visible on high contrast edges such as over actor's shoulder etc. Can it be fixed remotely as the plex has no projectionists or techs on site?  |  IP: Logged David Gibbons Film Handler Posts: 15 From: leesburg , fl Registered: May 2019 posted 10-23-2019 10:27 AM                     not sure about laser but it sounds like a convergence issue and that would need to be done onsite  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 10-23-2019 12:21 PM                        Christie offers digital convergence but I would definitely call a qualified D-Cinema tech in to manually perform the convergence calibration.  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 10-23-2019 02:32 PM                     Projector converge can be off, no matter if the light source is Xenon, phosphor-laser or n*3P-laser. It's an easily fixable problem, as long as you let a competent tech do the re-calibration. If one or more of the 3 DMDs don't properly align, you get a "rainbow shadowing" effect in different colors, depending on the affected colors. Those are especially good to see around hard edges.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-24-2019 09:05 AM                     I would definitely call a qualified D-Cinema tech  |  IP: Logged Andrew Carr Film Handler Posts: 26 From: Toronto, ON Canada Registered: Jan 2016 posted 10-24-2019 11:00 AM                        Which model is it? Convergence on the newer Christies is really simple. On the Boxers and larger RGB units they give you a test pattern with instructions on screen and there are both tools packaged in a compartment in the body and tool-less adjustment points inside the service door. Very easy to do. EDIT: Just re-read, you don't know the model. If you can ask someone on site to get you that info, take a look at the manual and determine if you need to hire a tech. It's very hard to mess up though...  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 10-24-2019 11:14 AM                     I think there is a software convergence tool now accessible though the touchscreen. I guess this can be used as a temporary measure, even remotely, if a tech can't make it to the location in time. This per-pixel correction should at least be able to reduce an annoying amount of misconvergence. Of course, given that this machine must be quite new and should have been converged decently from factory and installation, it is also possible that the software convergence is the actual cause of this issue if someone messed with it... - Carsten  |  IP: Logged Jonathan Smiles Film Handler Posts: 11 From: Devon UK Registered: Jul 2001 posted 10-27-2019 02:55 PM                        Thanks all, Jonathan http://www.imdb.com/name/nm1211866/  |  IP: Logged Jonathan Smiles Film Handler Posts: 11 From: Devon UK Registered: Jul 2001 posted 11-21-2019 03:34 PM                        A month after opening and still convergence issues on the non-IMAX screens. One screen has red bottom and green top borders on the edge of the screen as well as red/green halos on edges, it's like anaglphic 3D (I think I still have my Nightmare on Elm Street 3D glasses somewhere). Another screen was better with smaller red and green blurred halos. Most staff are apologetic, a few don't care and one said "most people won't notice".  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 11-21-2019 04:09 PM                     When I was a cinemacon in the Christie demo the image looked out of convergence to me. The red was noticeably off. I spoke to the Christie guys there and they assured me it was converged correctly and it was because I wore glasses and the narrow bandwidth of the laser light and that the red got bent differently than the blue and green and it appeared out of convergence. There may be some of this going on here. I know that the laser projector I installed a Barco 22L I did see some of that but not as bad as the Christie but the 22L is 6P and the Christie was a series 3 3P. More bandwidth with the 6P?  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 11-21-2019 04:13 PM                     It's in the numbers. 6P -> 6 primaries, 3P -> 3 primaries. So, the 6P machine has twice as many primaries. @Jonathan: Do you wear glasses or other "seeing aids"? Not intended as a personal question.  |  IP: Logged Frank Cox Film God Posts: 2234 From: Melville Saskatchewan Canada Registered: Apr 2011 posted 11-21-2019 04:15 PM                        Sounds like a good reason not to get one of those projectors if the image doesn't look good to people who wear glasses. Google tells me that about 64% of the population of the USA (and probably similar numbers elsewhere) wear glasses.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 11-21-2019 04:33 PM                     I guess that also some of the common types of optical coatings for glasses would create different amounts of issues. Wow. Never heard about that problem before. At the same time, it would be very unprobably that multiple auditoriums with brand new installations would all exhibit noticeable misconvergence right from the start. I think Christie has no phosphor lasers (which shouldn't suffer from that issue). So, this may be a real issue...but then, maybe Jonathan uses a very unusual pair of glasses? - Carsten  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 11-21-2019 05:12 PM                     I have coated lenses in my glasses to reduce reflections.  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 11-21-2019 07:34 PM                     I've also never really heard about this problem before, but it at least makes some sense. Refraction isn't just dependent on material, but also on wavelength, that's how we use prisms to split and combine colors in lamp-based projectors, among countless of other applications... Now, the technology to use some very narrow primaries to reconstruct something that looks like full-spectrum RGB images hasn't been deployed "en masse" before. We already know that some people are more sensitive for some wavelengths than others, that can create a considerable shift in perceived colors when using a "low primary" laser based solution, but this might be another problem that comes with the technology. I simply didn't expect it to be really noticeable, since the splitting of the beams occurs so short in front of the retina. So, it might be worth investigating if this is a real problem or if it's just a bunch of badly converged projectors. I agree with Carsten that it's somehow strange that a new complex would end up with a whole bunch of totally misaligned projectors. While not impossible, it would be a really sloppy job. quote: Stephan Shelley I have coated lenses in my glasses to reduce reflections. I don't think the coating will really make a difference, at least as far as I can think about it. The coating should absorb certain wavelengths better than others, but I don't think it will really have an impact on the refraction index.  |  IP: Logged

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