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Author
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Topic: Beware of bad SDDS tracks!
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Brad Miller
Administrator
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Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99
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posted 01-06-2000 03:36 AM
For anyone who is opening "Snow Falling on Cedars", beware as there is a major problem in reel 5 on some prints with the "P" SDDS track. Below is a picture of a piece of the leader.The interesting part of this is the damage looks physical, as under close observation, the scratching away of the track is clearly on the emulsion side. Most of it looks as if the track was "sprocketed". The print came from Deluxe Hollywood and was on dye washed Kodak 2383. Clearly, this does not play in SDDS. Of course, the DTS and SRD tracks are fine. This isn't the best picture, but it's the best I could come up with. If someone knows a better way than to shoot this strip other than backlit, please let me know and I will reshoot it. This is also a fairly tame example of the missing data on the P track. During the reel, there are sections 2 inches long where the P track is clear. Anyone care to hazard a guess as to what caused this?
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 01-06-2000 06:46 AM
The film may have jumped a sprocket in the printer or processing machine. If you can, send me a few feet of the damaged film, along with the print number. We can tell if the damage occurred when the film was dry, or still wet in the processing solutions. What makes you think that ALL reel fives were affected? Usually, the lab quickly finds a problem like this during print inspection, fixes the problem, and discards the defective reels. ------------------ John Pytlak, Senior Technical Specialist Worldwide Technical Services, Professional Motion Imaging Research Labs, Building 69, Room 7419 Eastman Kodak Company Rochester, NY 14650-1922 USA Tel: 716-477-5325 Fax: 716-722-7243
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 01-07-2000 12:00 AM
Heck, isn't a common problem of the vast majority of people threading film? But seriously, the labs have had the problems with Dolby digital too...who hasn't had a DD print where the the block moved into the perforation. And to not leave DTS out...had the track printed a little off such that the LED starts blinking or with enough of of the track playing havoc with the Left optical channel. Steve ------------------ "Old projectionists never die, they just changeover!"
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 01-28-2000 12:48 PM
Brad:Thanks for sending the 6-frame clip of the damaged print leader to Kodak for analysis. I gave it to our experts in MicroAnalytical Services and here is their report: "A short piece of 35mm processed film was received from the United Artists Galaxy Theatre in Dallas, TX. The film, SDDS soundtrack, used as leader, had been damaged along one edge, near the perforations. The customer wanted to know if the damage occurred pre- or post-processing. Photomicrographs were also requested". "Optical microscope examination of the damage revealed that most of the imperfections were closely associated with the perf holes and appeared as if they may have been generated by a sprocket. The imperfections, which looked like heavy scuff marks, were somewhat directional. The appeared to have come in from the outside edge of the film and dug in towards the perf holes. Cross-sections suggested that the damage most likely occured post-processing". Report dated 1/27/2000 I looked at the photomicrographs, and agree that the damage appears to have occurred after the print was processed. There are areas where chips of the magenta and cyan layers of emulsion with images of the SDDS bits have been peeled away from the film by the sideways scuffing action of sprocket teeth. Some chips were still attached to the film. I suspect that sometime after the lab processed the film, the film rode up off a sprocket, and was damaged by the teeth. It appears this type of damage would be an isolated incident that may have occured in the lab, or the exchange, or the theatre. From personal experience, I think the damage was done by a footage counter or syncronizer sprocket, since it is on unprojected leader. ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Professional Motion Imaging Eastman Kodak Company Research Labs, Building 69, Room 7419 Rochester, New York, 14650-1922 USA Tel: 716-477-5325 Fax: 716-722-7243 E-Mail: john.pytlak@kodak.com
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