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Posted by Evans A Criswell on 05/22/07 18:45
In article <slrnf2pjv1.qhh.nospam@debian.dns2go.com>,
Justin <nospam@insightbb.com> wrote:
>def456 wrote on [Mon, 23 Apr 2007 09:39:46 -0500]:
>> A lot of movies now come out on DVD in 2.35:1 aspect ratio, width to height,
>> so called anamorphic. That causes a large black area at the top and bottom
>> of the screen and poor picture quality with ordinary 4:3 TVs, and also
>> significant black bands at the top/bottom with the newer 16:9 widescreen
>> TVs. Since nobody has TVs to view 2.35:1 properly, why do they produce it?
>
>Because movies aren't made for TVs. They're made for movie screens,
>which ARE 2.35:1
Actually, the standard has been 2.39:1 since 1971 for projection, although
the camera aperture is 2.35:1. When the standard was changed, the theatres
did not recut their aperture plates overnight, though. :-)
The change was supposedly to minimize the appearance of lab splices in the
image.
The projector aperture for scope films is 0.825 inch by 0.690 inch, while
the camera aperture is 0.864 by 0.732, giving ratios of 2.39:1 and 2.36:1
when multiplied by 2 to account for the 2x horizontal stretching done by
the anamorphic lens.
I got the aperture dimensions from ANSI/SMPTE 59-1991 (camera apertures)
and ANSI/SMPTE 195-1993 (projector apertures).
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