P3D Re: PHOTO-3D digest 2685

[Rob <lilindn@xxxxxxxxxxx>]

> 
> It's based on acuity for black and white being superior to all colours.
> Colour TV uses the same trick (at least it does here, I know nothing about
> NTSC) of being a sharp B+W signal overlaid with a softer colour one.
..
   Yes. its also true of NTSC.  NTSC is actually very similar to PAL in
basic principle (though not compatible, but listing all the differences
here would clearly be going off 3d topic).
   Both take advantage of the fact that the human eye has more
B&W-sensing "rod" cells than color-sensing "cone" cells.  
   To demonstrate this effect, draw a wavy line on a piece of white
paper, then overlay a transparent yellow sheet, with a STRAIGHT edge
directly over the wavy line.  Step back, and your brain will perceive
that the yellow area has a WAVY boundary!
   Rob


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