On Feb 18, 12:12 am, Quixotic Nixotic nixot...@blueyonder.co.uk
wrote:
Instead of the original glass front strip it had some backlit cheesy
semi-clad mexican dancing ladies using those ribbed pictures that
change as you move (do they have a name?).
It's called lenticular motion effect or lenticular 3-D, depending on
which effect is used; both work nearly the same way. Some products
even combine both effects to produce a moving 3-D scene. Each vertical
rib is actually a long, thin lens (like a bar magnifier, if you know
what that is) and will magnify a very narrow strip of what's behind it
greatly in width. The catch is, as your viewing angle changes even
slightly, the strip that you're seeing changes position fairly
drastically, just like the old alcohol-filled thermometers, with the
super skinny capillary tube partly full of red-dyed liquid, that
suddenly appears as a very readable wide stripe if you stand facing
exactly perpendicular to the face of the thermometer. In the common
lenticular motion effect, by interleaving several strips taken from
different images in the same sequence behind each lenticular lens, the
magnification effect lets you see each lens as being filled to its
entire width with a little piece of the same image even though the
actual bit of print you're seeing is really only a small fraction of
the width of the rib. By changing your horizontal viewing angle, your
view through all of the lenses in the panel shifts to the next strip
in sequence behind each lens, and it seems as if the whole picture has
suddenly changed.
For the 3-D effect, the relationship between the printed strips and
lens ribs and the geometry of the ribs themselves, are made somewhat
differently so that each of your eyes will see a different strip in
the sequence across the panel, and the printed strips are made from
several different views of the same object or scene. For example, the
simplest 3-D lenticular images typically use 5 different views of the
scene. Looking directly at it from the proper distance, your left eye
may see view 2 while your right eye sees view 4. Shifting your
position a bit will let you see views 1 and 3, or 3 and 5. but if you
move too far off-axis, you may see views 5 and 2 (for example), and
lose the 3-D effect, or even invert it. Some 3-D lenticular images use
strategically placed black strips so that by moving too far off-axis,
the image simply blacks out.
A.J.
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