Re: [photo-3d] plain paper distance

[Paul Talbot <list_post@xxxxxxxxx>]

ron labbe wrote:
> 
> Actually, it DOESN'T MATTER how far away the piece of paper is
> (as long as no shadow falls on it)

Sure it does.  If David placed the paper background 85% of
the way between the foreground and the current background
of the ladybug image, it would do little to improve the excess
deviation situation.  If he is trying to determine the minimum
amount of background he must exclude for the image to work,
he needs to run a formula (or a lot of trial and error tests).

Whether or not he should allow the image to contain the
maximum depth range is another question.

> there is no pattern to detect there is NO discernable parallax.

I've not done tests with paper backgrounds, but I know film
grain has an impact on stereoscopic viewing.  What kind of
paper background has no pattern at all?  Normal white copier
paper has discernable patterns, so I would think the colored
versions likely do as well.  Does the background need to be
out of focus for it to have no impact on stereo viewing?

Paul Talbot

 

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