RE: Multiple lenses in Lenticular Images

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>From: P3D Gregory J. Wageman writes:
>
>Dan Shelly replies to my query:
>
>>A lenticular image is generally an image that lends itself to being 
>>viewed from different angles.
>
>OK, I can see how by selecting different pairs of images depending on
>viewing angle, a lent can give you a sort-of "holographic" effect, with
>the perspective changing slightly as you rotate the lent.
>
>But it seems to me that it should be *possible* at least, to use two
>full-frame 35mm images, since the Nimslo and Nishika both expose only
>this much film (four half-frame images).  These images would be taken
>at a normal stereo base.
>
>If one then used the lenticular material as a sort of "barrier-strip"
>display mechanism, one should consequently get an image with much more
>apparent depth (because of the normal stereo base), albeit viewable
>from only one angle.
>
>Is this essentially correct, or am I missing something key about the
>lenticular process?
>
>       -Greg W.


You have to think of lenticulars as lenses. A single stereo pair does
contain the necessary information but not the inbetween vantage points which
is needed with the lenticular. With an ordinary stereo pair you can slide
your eyes to any and all of the possible angles of view. In a lenticular,
all those variations have to be present at the many places the lens focuses
your attention. These places don't always coincide with where it's located
for a single pair of images.

The idea of viewing it from one angle presupposes that the material itself
provides different angles ranging from that very narrowly defined vantage
point. In reality a lenticular viewed from a very carefully stationery point
requires a number of sets of different pairs, which are made available at
the different angles. In other words, the lines of coincident pairs from a
fixed viewpoint are not parallel to each other.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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