Two Image Lenticulars

[P3D Gregory J. Wageman <gjw@xxxxxxxxxx>]

Bill Stratemeyer elucidates:

>Let's greatly exaggerate the situation so we can visualize what's
>happening, Think first of a Lenticular print that is 3D and 1" wide,
>everything the left eye sees is right of your left pupil, call this a 
>positive angle. Now enlarge this same print to 10' wide and viewed from
>the same distance, your left eye will see app 40% of the print at a
>negative angle( left of the left eye) the same views as the right eye's
>positive views. So the angle of view across the print, displays a mix
>of several stereo pairs.

I don't see how an additional image in between is going to change this
fact?

I guess what's missing is a diagram of how the lenticular screen refracts
the strip of image beneath it.  Damn this ASCII-only medium!  Can you
recommend a good book on the subject?  One with diagrams of how the
images are sliced up and placed, and how the eye-rays interact with
the lenticules?

>Two image lenticulars are only possiable in very small prints. Larger 2
>image prints result in only seeing depth in a narrow view between your eyes,
>this is of course dependant on your viewing distance.

Why can't you simply repeat the left and right images, as necessary,
across the screen, rather than using an additional image (as in the
ImageTech) or two (Nimslo) with a less-than-desirable interocular
spacing?

        -Greg W.


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