Re: how much of what we see is black?

From: Sam Wells (email suppressed)
Date: Tue Oct 30 2007 - 12:16:52 PDT

  Jeff Kreines wrote:

> Of course, there are no black spaces in digital projection, unless
> the filmmaker adds them (using a higher framerate and adding black
> frames between each frame, akin to how sequential-image 3D is
> projected these days). I wonder how the lack of a black space
> changes the viewing experience?

I've wondered what would happen (how it would look and feel) if you
made one of a DLP's _effective_ 3 refreshes per frame (24 fps = 72
Hz) black. (I say "effective" in that, to my understanding the pulse
-width modulation used in DLP has, for each frame essentially shown
the image three times). An engineer friend who has worked with DLP
told me this would be possible (might need messing with the firmware).

Or, one of the four refreshes per frame in Sony SXRD projectors. I
thought about this especially during a demo last January of the Sony
4K. The weak black level issue with current generation of that
machine came up, of course. But I started to think, perhaps one thing
that makes a film "black" feel black is the emergence from the no
light of the film projector dark period. You don't have this in
digital projection, so I'm wondering even if your blacks were very
deep it might not be as satisfying. I'm not sure -- but it's worth
bearing in mind though that *projected* black (print stock D-max) is
not really a dead black either (Altho Vision Premier pretty much is).


For info on FrameWorks, contact Pip Chodorov at <email suppressed>.