[photo-3d] Re: Trick/Creative photography in 3d

[Bruce Springsteen <bsspringsteen@xxxxxxxxx>]

It's always great when George shares his tutorials from the OSPS
newsletter.  The last one on trick/creative stereo techniques is a very
good summary.  It made me think.

I'm not sure how to generalize it, but another category occurs to me. 
I'll call it Replacements & Subject Shifts.  Both apply to sequential
stereo shots, where there is a space of time between the taking of left
and right images, during which something in the scene may change.

For example you might take a shot of a room with a picture frame on a
table.  In that frame is the right half of an existing stereo image of
your grandmother, smoking a cigar.  You then take a second shot of the
room, after moving the camera to the left, having also *replaced* the
picture in the frame with the left image of the stereogram of grandma.  In
viewing the resulting pair you would have a stereo within a stereo, the
picture frame containing a 3-D image within the larger scene.  In the APEC
exchange, Walt Wolff has done this on a computer screen in his digital
self-portrait "That's Me!" - I did it on a clipboard with drawn figures in
"Knot Impossible."

Or a kind of "false" depth can occur if an object in the scene is
*shifted* between exposures.  Moving clouds are an accidental example
recently mentioned here - but a photographer can deliberately move objects
horizontally between shots to make them appear farther or nearer in the
scene.  Moving shadows from a shifting light source can rise from the
ground or sink below it, depending on the direction of movement between
exposures - Hans Knuchel has used this to excellent effect. 
Alternatively, with either replacement or shifting, individual items can
be made to show depth while the surrounding scene looks flat as a painted
backdrop, simply by leaving the camera unmoved.

I wonder if there are other categories of trickery, unlisted or yet to be
discovered!

Bruce











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