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Author
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Topic: Anyone consuming HD or Blu-ray?
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Paul Mayer
Oh get out of it Melvin, before it pulls you under!

Posts: 3836
From: Albuquerque, NM
Registered: Feb 2000
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posted 03-07-2008 05:24 PM
A quote from the late great and sorely missed John Pytlak regarding the current SMPTE recommended anamorphic projector apertures and aspect ratios:
quote: I put together a chronology of the SMPTE standards specifying the image area for "scope" for Marty Hart's American WideScreen Museum: http://www.widescreenmuseum.com/widescreen/apertures.htm
From 1957 through today, there have been a number of small changes to the anamorphic projector aperture recommended standards. John P. Pytlak of Eastman Kodak dug through countless back issues of the SMPTE Journal in order to provide the following chronology of the changes to the standards:
The March 1957 SMPTE Journal has PH22.104-1957, the standard for 2.55:1 anamorphic (no optical track), with an aperture size of 0.912 X 0.715 inches. Notice of withdrawal of this standard was in the January 1964 Journal.
The December 1957 SMPTE Journal has PH22.106-1957 for 2.35:1 anamorphic, with an aperture of 0.839 X 0.715 inches. It was unchanged in the September 1964 Journal. The November 1965 SMPTE Journal published PH22.106-1965 still with the 0.839 X 0.715 aperture size.
In the September 1970 SMPTE Journal, a new draft of PH22.106 was proposed, with an aperture size of 0.838 X 0.700 inches, to minimize the flashes at splices. This was republished as standard PH22.106-1971 in the October 1971 issue.
In the June 1976 SMPTE Journal, the two (flat and scope) projectable image area standards (PH22.58 and PH22.106) were consolidated into one standard and renamed PH22.195. The publication of PH22.195-1984 in the October 1984 Journal still had the scope area as 0.700 X 0.838 inches.
The June 1992 SMPTE Journal published a proposed revision, with a scope area of 0.690 X 0.825 inches. In August 1993, the standard was published as SMPTE 195-1993, with the current area of 0.690 X 0.825 inches. So August 1993 is when the two formats became the same width of 0.825 inches.
BTW, with the current projectable area of 0.825 x 0.690 inches specified by SMPTE 195, and EXACTLY a 2X anamorphic squeeze, the on-screen aspect ratio calculates to 2.39:1.
------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Research Labs, Building 69, Room 7525A Rochester, New York, 14650-1922 USA Tel: 585-477-5325 Cell: 716-781-4036 Fax: 585-722-7243 E-Mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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