From: Todd Eacrett (email suppressed)
Date: Tue Oct 30 2007 - 13:59:05 PDT
The myth of persistence of vision was first debunked 30 years ago:
http://www.uca.edu/org/ccsmi/ccsmi/classicwork/Myth%
20Revisited.htm
Todd Eacrett
----- Original Message -----
From: Flick Harrison <email suppressed>
Date: Tuesday, October 30, 2007 1:28 pm
Subject: Re: how much of what we see is black?
> Hate to be a splitter.
>
> We don't actually "see" any blackness at all. From our point of
> view, there is no blackness.
>
> Aside from the witty comment on here that you can't see
blackness
> (it
> is the absence of an image, so it's more like not-seeing).
>
> Persistence of Vision is the phenomena wherein your optic nerve
(or
>
> whatever) takes time to "reset" i.e. cool down and stop
> transmitting
> the last image you saw.
>
> Frame rates which create the optical illusion of continuous
> movement
> are using this phenomena.
>
> The image stays in your optic nerve while the shutter closes,
> advances the frame, then re-opens just in time for your optic
nerve
>
> to absorb a new image.
>
> Your eye / mind never notices the blackness because it's not fast
> enough to see it.
>
> I.o.w., your eye is fooled into thinking there is no darkness. The
>
> darkness is too short for you eye's mechanism to register.
>
> It;s not like the optical illusion of a bunch of dots becoming a
> straight line as you pull back. That is simply perceptual / mental
>
> illusion, at least until you get back so far that the dots fall
> below
> the resolution of your eyeballs.
>
> It's more like an optical override.
>
> To be clear - continuous motion on screen is an optical illusion,
> created by a series of still pictures. Continuous brightness on
> screen is a neurological illusion, not an optical one - though
> that's
> splitting optic nerve-hairs.
>
>
> * FLICK's WEBSITE:
> http://www.flickharrison.com
> * FACEBOOK
> http://www.facebook.com/profile.php?id=860700553
> * BLOG / NEWS:
> http://zeroforconduct.blogspot.com
> * MYSPACE:
> http://myspace.com/flickharrison
>
>
> On 30-Oct-07, at 6:53 AM, Yoel Meranda wrote:
>
> > A question I'm curious about...
> >
> > When a film projector is running, what is the percentage of
time the
> > light is interrupted by the shutter? In other words, what
percentage
> > of what we see is darkness?
> >
> > I realize that this question will have different answers for each
>
> > projector...
> >
> > I am mostly curious about 35mm projectors but any clue on
any other
> > projector would be great. Even guesses would be fine if no one
has
> > concrete answers.
> >
> > Thanks,
> >
> > yoel
> >
> >
> >
_________________________________________________________________
_
> > For info on FrameWorks, contact Pip Chodorov at
<email suppressed>.
>
>
>
>
_________________________________________________________________
_
> For info on FrameWorks, contact Pip Chodorov at
<email suppressed>.
>
>
__________________________________________________________________
For info on FrameWorks, contact Pip Chodorov at <email suppressed>.