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This topic comprises 3 pages: 1 2 3
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Topic: Wavy lines
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 05-09-2002 07:10 AM
Sarah said: "Our LOTR first four reels had that, plus dark splotches scattered throughout. Ick."Again, a "wavy line" discoloration or density along the far left side of the 35mm image is likely soundtrack developer that has "bled" into the picture area. If you remove the projector aperture and project the analog soundtrack area on the screen, you'll see what I mean. "Dark splotches scattered throughout" are likely droplets of the soundtrack developer that splashed into the picture area. Request a replacement reel. Steve is correct, these problems are not related to the lighter "enhanced" prints being made for IMAX theatres and drive-ins, which are simply printed at a lighter setting. ------------------
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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Sarah Werning
Film Handler
Posts: 3
From: Mundelein, IL, USA
Registered: May 2002
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posted 05-10-2002 04:38 PM
Ah, we are talking about different things then. Our wavy lines are hard to describe... For one thing, they do not stay in one place, they sort of move back and forth. They are not scratches or anything like that; rather, they look like the patterns you would get if you threw paint thinner on a freshly-painted wall and let it drip down. Uneven, lighter swashes of color that sort of move side to side and back on the screen. It tends to be several on screen at once and they are really annoying (to me, anyway). Most of the reel is affected; it doesn't necessarily affect other reels.Now, I have only seen this on our reel three of Spider-man, and reels one to four of LOTR, but had talked with other people who had seen it on their prints. All of these prints were "color enhanced" (Technicolor's words, not mine) for 35mm presentations on IMAX screens, so that is why I had assumed it was inherent to these types of prints. It may be a common problem I've been fortunate to avoid in regular prints so far. The soundtrack developer splashes sound like a good explanation for the LOTR splotches problem; or course I requested replacement reels immediately after I had screened LOTR the first time. The new reels looked much better. Anyone else see this on 35mm prints, "enhanced" or otherwise? Sarah Werning
Chief of IMAX Projection
Regal IMAX Lincolnshire
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David Stambaugh
Film God
Posts: 4021
From: Eugene, Oregon
Registered: Jan 2002
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posted 05-10-2002 05:52 PM
Saw Spiderman with a group today (2nd time for me), in the same theater as before. This time since I knew the wavy lines were coming I paid a little more attention. In reel 4, the lines appeared at 13 mins into the reel; in reel 5, it was 10 mins in. And in both cases, the SDDS sound was affected. I'm not sure exactly what happens when the primary SDDS track drops out -- does it fall back to the secondary SDDS track, or to analog? Anyway both times when the wavy lines showed up, there was an audible click in the audio, a slight change in the sound character that lasted 4-5 seconds, then another click and a return to normal.Just so we're sort of on the same page, these "wavy lines" are faint horizontal shadowy bars superimposed across the entire frame. They usually last for a few seconds, and they appear to be rolling downward (could be an optical illusion though).
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 05-12-2002 08:07 PM
David said: "Anyway both times when the wavy lines showed up, there was an audible click in the audio, a slight change in the sound character that lasted 4-5 seconds, then another click and a return to normal.
Just so we're sort of on the same page, these "wavy lines" are faint horizontal shadowy bars superimposed across the entire frame. They usually last for a few seconds, and they appear to be rolling downward (could be an optical illusion though)."The symptoms described could be caused by a slight "stutter" in the printer transport, or a bit of slippage in the gate. Sounds like it occurs randomly, so the lab would benefit if the print was returned with the details of the problem, so they could find and fix the cause. ------------------
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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