Ripples in IMAX

[P3D Marvin Jones <72657.3276@xxxxxxxxxxxxxx>]

>     David Hutchison (<DavidH8083@xxxxxxx>) recently posted:
> 
> >    I would vote for the Polaroid version, since the LCD version suffers
> >    from the sync problems inherent to field sequential display systems.
> >    The problem manifests itself with that well-known distortion of
rapid
> >    action in which fast-moving lateral action breaks up into a kind of
> >    apparent "watery ripple". I find it very annoying.  Others are less
> >    bothered by it.
> 
>     Interesting.  I have seen the LCD versions of 2 films in NYC ("Into
the
>     Deep" and "Across the Sea of Time") and the LCD version of "L5" in
>     Vegas and in neither case did I notice this.  I'll have to watch for
it
>     next time.  I would have thought the higher than average frame rate
of
>     the IMAX system would solve this particular short-coming with LCD
>     systems.
> 
I am also a little surprised at David's seeing what he calls the "ripple
effect" in IMAX LCD stereo. I'm familiar with the effect from Toshiba
videos, but I understood it to be caused by the fact that the left and
right eye images 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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