P3D Re: toe-in

[jacob@xxxxxxxxxxxxxx (Gabriel Jacob)]

Ron Labbe writes

>Toe-in is an interesting 3D subject. It generally so subtle that it's
>not noticable, such as in the case of Boris's slides. But even rotation
>may not >be "noticable", though their may be an uncomfortableness detected.

I concur with that statement. :-) What you cannot see is very important,
and is often underestimated in importance. Our subconscious sees alot,
and often times doesn't tell our conscious, or at least not in so many
words (or thoughts). Even when we don't consciously find an image
uncomfortable, it doesn't mean we don't detect "it". "It", in this case
being keystoning, resolution, flickering, distortions, etc.

>that slides of toed-in stereos would tend to produce eye strain/fatigue
>much more quickly than similar parallel shots, even if one cannot say for
>which images were toed-in. The idea in stereo, for me, is to strive to
>present the stereo illusion in best manner possible (given the MANY
>obstacles!)

Very true. There are enough distortions to contend with (which can be
used quite creatively without introducing mismatches. Keystoning ranks
up there with rotation, misalignment, etc.

Boris wrote,
>Of course, the keystoning is subtle, proven by the fact that not one
>of the many critics on P3D has yet noticed it.  (It's also not as
>noticeable on-screen) So you will have to look carefully for it.

Ah, but you forget that I did comment (offline) on some of your images
having too much disparity. Or at least that's what I thought was causing
my discomfort in SOME images. I never mentioned toeing in, because I
never thought you would have committed this cardinal SIN! ;-)

Seriously speaking, as Dr.T mentioned, sometimes this evil is unavoidable,
and has to be tolerated as in telephoto shots. Done at very small angles
it's not objectionable, but I have seen it enough, where just a bit too
much and the image just doesn't look right. It's hard to describe but
I know when I see it. In your images it was hard to detect due to two
factors, the disparity and/or toeing-in, but what the heck, I have put
in my picks on which ones I think they might be. 

Gabriel


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