P3D Re: rules

[jacob@xxxxxxxxxxxxxx (Gabriel Jacob)]

Dr.T writes:
>Some time ago Boris asked us to look at his images and identify
>the ones with keystone distortion (part of his early work).  We
>took our rulers out and measured carefully.  We could not see
>anything.  Boris told us that all of them had keystone distortion
>because he was toeing in the lenses in his twin SLR rig, before
>he knew better.  Well, it was there but no one could see it.

Ummm, excuse me, ;-) but we COULD see something. It didn't really
prove anything because I (and I suspect others) had a hard time
figuring which of the images DID NOT have keystone distortions!

Boris (you prankster!), said about half (if I remember correctly)
had keystone and the other half didn't. To me, MOST of them seemed
to have  varying degrees of keystone distortion, but only chose
half because the "rules" stated so. It's true a very small
percentage seemed not to have any distortion but this only proves
that in moderation it can be used.

>Applying the McKay principle "if we cannot see it, it is not there".
>And we are all happy!

As you know, in certain cases, "yes" but in other cases "no". This
statement has to be qualified and is not true in the broad sense of
the term. In Peter Abraham's last post he explained quite well why
this is so. 

There are two kind of things we cannot see. Stuff that minimizes 
enjoying the maximum potential of an image without one consciously
realizing it. And then there is the stuff which has no impact on
an image. Insert any technical term you want for "stuff". :-)

Now how do we avoid the stuff that robs us of deriving the full
potential of 3-D. Just like anything else, better 3-D and 
education. A person who might not know much about fine wine
or high end audio systems won't taste or hear a difference. Does
that mean there is no difference. Philosophy aside, of course
there is.

So to the question:
>Can we see the distortion?
Are you saying we can't?

Quick SOMEONE, call the Keystone Cops!

Gabriel



------------------------------