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Aspect Ratios on HD Set and Monitors


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#1 Joe Taylor

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Posted 02 July 2006 - 12:35 PM

How come some DVD Cases will sometimes state the film's anamorphic aspect ratio of being, say, 1.78, or, 1.66, 1.85, but they always fill the screen, which is 16x9. (Except 2.35 films, which are always close to their stated ratio.

If a case claims 1.85, then it theoretically will not fill the screen since it will be wider then the 16x9.

Am I missing something here?
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#2 Stephen Williams

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Posted 02 July 2006 - 12:49 PM

How come some DVD Cases will sometimes state the film's anamorphic aspect ratio of being, say, 1.78, or, 1.66, 1.85, but they always fill the screen, which is 16x9. (Except 2.35 films, which are always close to their stated ratio.

If a case claims 1.85, then it theoretically will not fill the screen since it will be wider then the 16x9.

Am I missing something here?


Hi,

16x9 is actually very close to 1.85.
The telecine operator will probably slightly zoom to fill the screen or have a very small letterbox that you may not see.
Many TV's will fit the image to the screen size, depending on the software set up.

Stephen
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#3 David Mullen ASC

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Posted 02 July 2006 - 06:57 PM

Yes, 16x9 is 1.78 -- which is so close to 1.85 that the slight letterboxing for 1.85 may be outside your 16x9 TV set's frame, in the overscan area. It's only a few scan lines of black at the top and bottom.
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#4 Chance Shirley

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Posted 02 July 2006 - 07:08 PM

1.85:1 is transferred for 16x9 with very slight letterboxing. 1.66:1 is transferred for 16x9 with very slight "windowboxing" (thin borders along the side). I've found that the letter/windowboxing is often lost in the overscan area of televisions. I can't really explain overscan, buy you can read about it here:

http://scanline.ca/overscan/

And here:

http://en.wikipedia.org/wiki/Overscan

EDIT: Looks like David beat me to the punch.

Edited by Chance Shirley, 02 July 2006 - 07:09 PM.

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