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Author
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Topic: STAR WARS II - Picture movement on screen
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John Wilson
Film God
Posts: 5438
From: Sydney, Australia.
Registered: Dec 1999
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posted 05-23-2002 06:18 AM
Hi Jamie and welcome aboardAre your ads and trailers doing the jump thing also? There are scenes in SW that move around and yet others that are steady as a rock. ------------------
"It's not the years honey, it's the mileage". - Indiana Jones.
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Manny Knowles
"What are these things and WHY are they BLUE???"
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 05-23-2002 06:13 PM
Ron: For what it's worth, I have noticed a small, yet discernible amount of "jump" (vertical instability) during tail credits on every projector I have ever worked with.Tail credits reveal this problem moreso than actual footage because the movement of credits is uniform and predictable. Obviously, static credits (aka "title cards") would reveal this even more. The point is that you may not really have a problem. In order to rule out the existence of a mechanical fault, you'd first need to measure the severity of the jump in your projector. Among its many uses, the SMPTE 35-PA (aka RP-40) test film is designed to help determine if your projector is within the specified tolerance limit for jump (and also "weave" which is the side-to-side equivalent). ------------------ ~Manny. Now...where was I ?
Leonard Shelby, MEMENTO.
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 05-24-2002 12:31 PM
One possible source of vertical unsteadiness is the common practice of using a continous contact printer to print a short pitch original to a short pitch raw stock, such that there is slippage in the printer gate. Continuous contact printers require a short pitch original and a long pitch raw stock for optimum steadiness. Otherwise, a pin-registered step printer should be used, such as for printing a long-pitch master positive to a short-pitch duplicate negative:
http://www.kodak.com/US/en/motion/support/h1/sizesP.shtml#perfs On some continous contact printers, improper adjustment of the tensioning of the film as it goes over the printing sprocket can cause intermittent vertical unsteadiness. One quick, sure way to tell if the unsteadiness is from your projector is to pull the aperture plate, and project the edges of the print's perforations. If the print perfs are "rock steady" and the image is moving around, the unsteadiness was printed in. ------------------
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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