Re: [photo-3d] Ghosting / Cross-cancellation

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

----- Original Message -----
From: <stonieorl@xxxxxxx>
To: <photo-3d@xxxxxxxxxxxxxxx>
Sent: Tuesday, April 17, 2001 12:45 PM
Subject: Re: [photo-3d] Ghosting / Cross-cancellation


> Is there anything a body can do to control or elemate this ghosting either
> before shooting or after. I have some really good full frame 35mm pairs
that
> I don't project  because of the ghosting. By the by they are contrasty.

Before shooting, look carefully at the scene and see if a different camera
position that will eliminate certain high contrast elements is feasible.
After, try to mount slides or crop Internet pix such that high contrast
image parts (such as street lights in nighttime scenes) are near the plane
of convergence.

Add elements that reduce the overall contrast, such as middle-tone depth
cues or references that can sometimes be added on the computer.   Avoid high
contrast neutrals such as pure blacks and pure whites.  Color can lower
contrast.  For example in the above mentioned night scene with street
lights, a pair of yellow filters over the camera lenses (or even mounted in
with the slide!) will turn the street lights from white to yellow, which
slightly lowers the contrast, which can reduce the amount of ghosting you
see, yet yield a believable picture (some street lights ARE yellow).
Crossed polarizers, as previously mentioned, usually ghost to dark blue, not
pure black.  The yellow filter helps to counter this effect also.

Other things can often be done during original photography, depending upon
the characteristics of a specific scene, if you think about it.   Compose
pictures so that high contrast elements are not adjacent to each other.  For
example, if there is a black pole in front of a white house, have someone in
bright colored clothing pose in front of the pole, so that it does not
occupy a predominant part of the frame.

When possible, choose lower contrast film stock.    Do not push the film in
processing (which increases contrast).

JR


 

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