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- To: telecine at alegria.com, Dick_Hobbs at compuserve.com
- Subject: Multiformat Telecinies
- From: Steve Russell <SRussell at MAIL.PHBTSUS.COM>
- Date: Fri, 13 Feb 1998 12:10:43 -0700
- Resent-Date: Fri, 13 Feb 1998 11:14:26 -0800
- Resent-From: telecine at alegria.com
- Resent-Message-ID: <"QThljD.A.0iE.BtJ50" at sun>
- Resent-Sender: telecine-request at alegria.com
- Resent-To: multiple recipients of <telecine at alegria.com>
Dick Hobbs wrote :
>> like Spirit - a high definition telecine
>>with output resolution converters to get other standards
I think one slight difference between the Sony machine and the Spirit needs to be clarified. the Sony machine relies on frame capture CCDs which will be 1920 X 1080 frame sensors which are physically manufactured for a 16X9 aspect ratio. Therefore, regardless of the final output this has to be derived from a 16:9 aspect ratio ( interlaced ) HDTV image, and the vertical scanning resolution is limited to 1080 lines.
What happens with Cinemascope images ? - this has the tallest frame height, and is not physically shot on the film in a 16:9 aspect ratio - therefore to get a one for one pixel mapping of the image onto the sensor would require anamorphic camera lenses - and then it would be a 2.35 image mapped onto a 16X9 sensor - still not a fit - something has to suffer in terms of resolution horizontally or vertically depending on how Sony intend to do this.
Using 2 dimensional scanning is valid - as long as the image on the film is shot in 16X9 and you get a one for one mapping ratio. Any other film aspect ratio would either require optical correction via the projector lenses ( expensive if a lens is needed for every film format ) or correction in signal processing - which will loose resolution.
The Spirit is a line array machine, and therefore only limited in resolution in one direction - i.e. horizontally the maximum scanner resolution being 1920 horizontal pixels. We are not limited in the vertical domain and in fact scan in excess of 1800 ( progressive ) lines vertically for a cinemascope image.
The Spirit is not a just a *HDTV telecine with format converters* - this would imply the scanner resolution is only 1920 X 1080 - when in fact it is not limited to 1080 vertically.
Also to clarify the statement of Mr. Jim Mandrella - the Spirit will offer additional DTV format compliance and this will be available later this year. We will initially support 1280 X 720 in 30P and 60P ( with pull down ) 24P will be added when there is a standard for it. 480 progressive will also be supported again in 30P and 60P ( with pull down ) and 24P added later.
Marketing Manager - Film Imaging Products
Philips Digital Video Systems Co.
Thanks to A.F. Associates for support in 1998
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