This example shows how small the lateral distortion on photos
need to be to in order to achieve a 3D effect. Examples for
parallel viewing and cross eyed viewing are shown below.
The open source Gimp application contains a filter called iWarp. This filter
can distort photos in many funny ways. A jpeg file containing two identical
photos can be found here. After loading them into GIMP, the following should
be the result.
Only the move mode will be used. The deform radius and amount will be varying.
It is not a bad idea to resize the Iwarp window to view the preview better.
When one views in the parallel mode, moving images in the two picture towards each
other will make them appear closer. For this example, moving background images by
around 1mm away from each other appears to cause the hair to stand out.
The preview window can display the results in real time. If one prefers the cross eye
method, then the movement needs to be done in the opposite direction.
It is perhaps best to start moving large objects, and work down to smaller details.
Ideally one would want to move the head in both pictures as whole units towards
each othet. But the movement tool appears to be done perhaps like an air brush.
Movements as small as 1mm really stand out.
To add depth within a face, a smaller radius is needed.
This example has only added 3D details to things like the nose and
This example mainly shows that the magnitude of lateral distortion
needed to 3D-tize a photo appears to be pretty small. It would not be
hard to write some software to do this using a modifiable standard face
The movement of the pixels can best be displayed on a grid. Different
radiuses and magnitude are shown below.
The movement of the pixels within a midrange radius are as such.
Ideally the desirable lateral distortion movement applied to a grid should
match the projection of two grids at different angles on a face.
Here is an attempt to do a Lincoln Photo. Doing 3D details around the eyes would
require some small and precise movement. Something like a mesh map plugin
might be needed.
Red/Blue to Stereo.
Red/Blue to Gif Movie.
Paint a Third Dimension onto any Photo.