Re: Keystoning/Ghosting

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxx>]

>1) does a faded but not disappeared image prevent a stereo effect from
being achieved ? (ie. each eye will see mostly its own image but also a bit
of the other eye's)

This is known as "ghosting" (or cross-talk) and it is common in projection
and anaglyphs.  In projection it depends on the amount of contrast in the
slide... Only certain slides will show it to the point that it is distracting.

>3) Should ALL 3d photos be taken as parallel views, or is keystoning
(centering a specific NEAR subject in both images (non-parallel views) have
advantages in some cases? I have read that keystoning is bad...BUT, I've
seen some awesome anaglyphs that had the DISTANT objects more greatly
separated than the near ones....which seems contrary to the parallel-view
method. What is going on?!

I think you are confusing keystoning with hyperstereo or something else...
Keystoning will introduce some distortions and it should be avoided.  It has
the advantage of allowing you to set the stereo window at will without
masking and loss of image area.

>what is needed to have objects seem to pop out of the image plane? Longer
baseline, keystoning, or simply nearer objects?

Longer baseline and nearer objects.  "Keystoning" is the name given to a
distortion, not a stereo effect.

George Themelis
Note new email account:  DrT-3d@xxxxxxxxxxxxxxxx


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