Re: [photo-3d] 3D Film Festival in Palo Alto, CA

[Oliver Dean <3d-image@xxxxxxxxxxxxxx>]

Chris Bruns wrote:
> 
>   I watched "Dial M for Murder", "House of Wax", "Creature from the Black
> Lagoon", and "It came from Outer Space" recently at the Stanford Theater.
> <skip>
>   I noticed that in most of the movies, objects moving rapidly to the left
> appeared too close to the viewer, while objects moving to the right appeared
> too far away.  The system involves two projectors, and at first I assumed
> that they must be very slightly out of sync.  Then it occurred to me that it
> might be the Pulfrich effect.  Especially "The Creature from the Black
> Lagoon" showed horribly different image intensities between left and right
> in many parts of the film.  Plus I think the right projector is genuinely a
> bit dimmer than is the left.  

Your "pulfrich effect" explanation is novel, but I think the more likely
one is "out of synch."  The symptoms you describe are exactly correct
for the case in which the left-eye image is lagging out of synch behind
the right-eye image by one or more frames.  If the right eye image were
dimmed sufficiently for Pulfrich effect, the right-eye images would be
lagging behind the left-eye images, resulting in the reverse of the
symptoms you observed. 

Another symptom of out-of-synch conditions is a kind of insubstantial,
"watery" look to moving objects, especially when there is a strong
vertical element to the movement.  This annoying effect is especially
visible with fabrics and lip movements, and with strong vertical
movements and gestures.  Did you notice any of this while you were
watching the films? 

Cordially,
Oliver Dean

------------------------------------------------------------------------
Double your manufacturer's warranty on all computers, 
home appliances, and electronics AND win up to $500 
towards your purchase!
http://click.egroups.com/1/3749/8/_/160438/_/958013588/
------------------------------------------------------------------------