Re: how much of what we see is black?

From: Flick Harrison (email suppressed)
Date: Fri Nov 02 2007 - 09:32:44 PDT

On 31-Oct-07, at 3:43 PM, Jim Carlile wrote:

> Flicker is caused by the 'intermittency' of the projected frames,
> not the darkness caused by the sector blade intervals.

I disagree.

Intermittency is some property other than the dark spaces between the

Like, night is caused by the "intermittency" of the daylight, not the
darkness caused by the sun going down?

Intermittency = lack of image = darkness.

> If you could somehow replace the sector blade dark moments with
> white light, say during the pulldown phase or when the other blades
> circle around and break up the image, you'd still have flicker.

You could do that by putting a mirror on the shutter, like if you
shone a flashlight into the reflex viewfinder of a movie camera while
rolling, you'd see light through the lens.

According to POV, at 48fps, you wouldn't have visible flicker in that
case - you'd have a washed-out image.

The image would persist while the white was flashing, and the white
would persist while the next image came up.

At slower shutter speeds, you'd see a flicker between image and white.

Darkness, he no trigger optic nerve.

Lightness, she trigger optic nerve.

That's the p.o.v. theory.

Darkness doesn't persist. Lack of image = darkness. White light is
not darkness.


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