LCD Imax

[P3D <DavidH8083@xxxxxxx>]

Chuck field writes:
There were a  couple of scenes in "Across the Sea of Time" that looked a bit
funny, to me.  I would never have known how to describe the effect ....until
now.  This ripple effect is DEFINITELY what I was seeing.
There's a scene where the camera is moving (tracking?)  in front of some
 people who are roller skating in the park.  It looks as if you were
rollerskating (backwards) with them, in the same direction.  (pardon my lack
 of proper terminology).  In this scene, though, I noticed the sorta slightly
 distorted / ripple effect.
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Hutch replies:
That's a good description and it is always a problem with alternate frame
projection systems and LCD viewers.
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Marvin Jones writes:
mages were photographed slightly out of synch (back and forth and back and
forth), thereby being incrementally different when it came to fast action.
However, I don't think the IMAX movies are photographed that way--each eye
image should be the split-second partner of the other, thus eliminating the
effect.
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Hutch replies:
The movies ARE photographed in sync, which is why they work so well when
projected in Polaroid in sync.  However, when they are projected out of phase
with the LCD glasses, the stereo image falls apart in rapid action or lateral
action becomes pseudo or hyper depending on whether the action is left to
right or right to left on screen.

David Hutchison
STARLOG Magazine
davidh8083@xxxxxxx


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