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Author Topic: Weird "screen door" effect on christie Kyle Butler Film Handler Posts: 47 From: Belton, TX Registered: Jan 2010 posted 09-11-2010 04:14 PM                     I went over to a local AMC a week ago to catch Machete, and i noticed something weird with their projector. They converted to all digital about 3 years ago. I noticed a weird "screen door" like effect on the screen. It wasn't pixelation though. It was bigger, and all of the boxes seemed to have a redish/blue glow. Its hard to explain. Seems like some form of image degradation. anybody have any ideas?  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 09-11-2010 04:33 PM                     Moiré?  |  IP: Logged Chase Taylor Expert Film Handler Posts: 175 From: Troy, Alabama, USA Registered: Mar 2001 posted 09-11-2010 04:35 PM                        It could have been bad convergence or if it was on the edge of the image it could be the integrator rod at fault.  |  IP: Logged Kyle Butler Film Handler Posts: 47 From: Belton, TX Registered: Jan 2010 posted 09-11-2010 05:34 PM                     The look of Moire best describes it, but i don't think it was moire. the pattern was too uniform, static, and highly visible irregardless of the picture shown. I guess it could have been the convergence. It wasn't anywhere near the edges of the screen, mostly the center of the right side.  |  IP: Logged David E. Nedrow Master Film Handler Posts: 368 From: Columbus, OH, USA Registered: Oct 2008 posted 09-12-2010 12:30 PM                        quote: Kyle Butler The look of Moire best describes it, but i don't think it was moire. the pattern was too uniform, static, and highly visible irregardless of the picture shown. Still sounds like moire caused by the pixel elements of the projector being too closely aligned to the perforations in the screen. That type of moire pattern won't vary in shape/size, since the screen and projection element aren't changing in relation to one another. Some screens can now be ordered with a "digital projection" option, which basically cuts the screen in such a way that the perforations aren't perfectly level, thereby making it less likely for screen/projector moire to be apparent. We have to slightly defocus our digital projector to reduce the moire pattern. But remember, digital cinema will always be perfect when compared to film cinema. Just ignore any projection/screen/sound/seating problems. -David  |  IP: Logged Kyle Butler Film Handler Posts: 47 From: Belton, TX Registered: Jan 2010 posted 09-12-2010 10:22 PM                     Ive heard of that being a problem, but i went to this theater the first day they re-opened with all digital,and it certainly looked nothing like this. It actually looked decent for d-crapema (copyright 2010 tony bandera)  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 09-14-2010 06:18 AM                     What was the screen size and how far from the screen were you sitting? How do you know it's a Christie? At least if you're close enough to the screen, issues are relatively easy to analyze usually. Good optics properly focused will reproduce sharp edges of any pixel artifacts. Anything 'blurry' will usually be related to lens issues. Panel deconvergence will usually also be seen uniformly accross the screen. Anything like convergence NOT uniformly spread accross the screen will again have to do something to do with the lens. Of course, the more issues present at the same time, the less chance to tell which individual issues these go back to. - Carsten  |  IP: Logged

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