IMAX

[P3D Ray Hannisian <ray3d@xxxxxxxxx>]

Oliver Dean writes: 
(Regarding flicker rates in IMAX...)

Thanks, Oliver.  

Sorry.  I didn't mean to be so picky about the "field" vs "frame"
terminology.  (Actually, I should have read the post more carefully before
responding.)

However, one thing that should be considered is the fact that either 30 or
48 images per second are interspersed with an additional 30 or 48 periods of
occlusion, (thus 60 or 98 HZ).  Many people ARE sensative to 60 Hz
alternations, even from flouresent lights.  Once you get into the 90-120 Hz
range, flicker is usually unnoticable.  

When watching a TV in anything but a totally dark room, I feel that the
'blacking out' of the ambient light, (between the 30 images per eye), is
more responsible for the perception of flicker than the number of images on
the screen.

Most LCS glasses include neutral density filters to reduce perceived
flicker.  I'd rather remove the filters and turn out the room lights.  After
a few minutes, I tend to stop noticing the flicker, and the brighter colors
and details are worth it to me.

IMAX has the advantages of 96 vs 60 Hz and a controlled viewing room, as
well as a lower brightness than a CRT.


Ray Hannisian
 
   ====== Ray 3D - Stereoscopic Imaging ======
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