From: Pip Chodorov (email suppressed)
Date: Sun Mar 05 2006 - 18:21:26 PST
>
>> Film creates time through
>> space (consecutive frames 24 times a second) while video creates
>> space through time (flying spot over a trellis of lines).
>
>This is exactly the sort of thing I am talking about --- times have changed,
>and this is not the way video projectors work these days.
Sorry I should have specified that I meant TV set technology. I
equate video with TV sets and generally prefer them to videprojectors
for blacker blacks and richer colors and not cutting off the edges of
the frame.
At 8:48 PM -0500 3/5/06, Mitsu Hadeishi wrote:
>In fact, unlike a film projector which relies on
>persistence of vision to fool the eye into thinking the moving image is
>continuous even though you're watching blackness half the time, an LCD
>projector shows a continuous image
An interesting and common misconception is that the illusion of
movement is created by the persistence of vision. In fact,
persistence of vision would only serve to superimpose the frames one
on top of another (such as is the desired effect in a thaumatrope -
canary and bird on opposite sides of a spinning disc). In fact it is
the Phi Phenomenon which allows us to perceive movement. The Phi
Phenomenon is the process by which a light which blinks on our left
followed by a light which blinks on our right appears in fact to be a
solid light moving from left to right. It is this phenomenon that
causes us to see blinking lightbulbs as moving around a marquee. It
requires 30 milliseconds of black between blinks. During the black
between frames in the movie theatre, our brain fills in the gaps
between consecutive pictures, creating the illusion of movement.
Apparently this is why some people prefer 24P projectors to blink
with a shutter. In Edison's time tests had shown people prefered 5
frames per second, later 15. Maybe our brains are getting faster.
-P
__________________________________________________________________
For info on FrameWorks, contact Pip Chodorov at <email suppressed>.