I forgot to say in the other thread, that you need red/blue glasses to see the 3D effect.
These modern 3D films work by simulating our eyes with two cameras, which ideally would be spaced 70-80mm apart, that being the average distance between human eyes.
And by using polarization or red+blue glasses or shutter glasses like modern 3DTVs, the main objective is to make each eye see a different image, slightly apart.
The original backyard images were not photographed to suit 3D imagery, but had sufficient movement in the horizontal to make effective 3D pictures.
The autopsy photos according to Groden have composited(stuck on) damage, but when you view them stereoscopically the depth and accuracy of both photos prove we are looking at a solid shape.
The HSCA photographic experts explain the reasons behind using stereoscopic photos to analyse the autopsy photos.Visual inspection of the autopsy photographs and transparencies revealed no evidence of retouching, compositing, or other evidence of fakery. Because all of the relevant photographs were studied stereoscopically, it is extremely unlikely that evidence of fakery would have escaped detection.
Stereoscopic viewing is made possible when two photographs of a subject are taken from a slightly different position in space (that a few centimeter movement of the camera or a similar degree of movement by the subject photographed). This was made possible in the present case because the autopsy photographer, in an apparent effort to insure a good final result, took two or more pictures of each relevant view.
Because pairs of stereo pictures may be seen in three dimensions, such photographs add depth to the perception of the photographed scene in much the same way as a pair of human eyes, separated from one another in space, can perceive depth.
In viewing stereo pairs of photographs through a stereoscope, one eye views one picture and the other eye views the second picture. As a result, the eyes, coupled with the visual image processes of the brain, are able very readily to perceive any differences between the two pictures. Such differences in the scene between the two pictures tend literally to "pop out at you." No differences of this kind were by the panel in stereo pairs of Kennedy's head, top of his head, the large skull defect, the of the head, back wound or the anterior neck wound. In this way, photographs of each of Kennedy's wounds were effectively authenticated.
The HSCA photographic experts explain the reasons behind using stereoscopic photos to analyse the Backyard Photos(374) The backyard pictures were also visually inspected
with stereoscopic techniques that permitted the prints to be
viewed in three dimensions. This was possible. because the
camera's movement exposures 133-B and 133-A resulted in two
views, only a short distance apart, of a single scene. When these
two pictures are viewed together in a stereo viewer, they give
rise to a three-dimensional image. (161)
(375) This analytic technique is useful in the detection of
fakery because photographs of prints (i.e., a photographic copy
of a photograph), when viewed in stereo, will not project a
three-dimensional image unless made from different viewpoints
along one axis. Further, any retouching of an original
photograph of a scene can be detected because when two
photographs of that scene are viewed in stereo, the retouched
item will appear to be either in front of, or behind the plane in
which it should be lying. It is virtually impossible to retouch
one or both images of a stereo pair with enough skill to escape
detection when viewed stereoscopically.
(435) Finally, because of the movement of the camera
between exposures, these photographs could be viewed
three-dimensionally in stereo pairs. When this is done, the post
properly appears to stand out in front of the fence while the
fence in front of the buildings is positioned further back. Many
of the dark areas that look like leaves on the bush on the right
(and consequently make the foliage appear to be unseasonably
thick) are found to be shadows of these leaves on the wall behind
the bush, the bush and its leaves stand out from the wall,
whereas the shadows lie flat against it. If a single photograph
of the backyard had been taken and several copies of it then
made, the photographs when viewed together stereoscopically would
have exhibited no difference in alinement between foreground and
background objects. It would be obvious that it had been a flat
photograph that had been rephotographed, rather than the real,
three-dimensional backyard.
(436) The finding that the backgrounds of these two
photographs can be viewed stereoscopically has an important
bearing on the question of authenticity. The falsification of
stereo pairs would require extremely precise positioning of all
points in one image relative to the points in the other. An error
in the relative positions would be readily detected because, when
the pair is viewed together, erroneously placed points would
appear to lie either in front of or behind the plane in which
they should be lying. It is unlikely that a sophisticated
conspirator would attempt to falsify images by producing a stereo
pair, since one picture would obviously be sufficient, easier to
produce, and less susceptible to detection.
