| The piece of plastic with the ribs or
bumps is called a lens, or lenticular sheet. It is actually a lens,
complete with an angle of view ( ( how much you can move the piece
before the interlaced images repeat themselves ), and a depth of field
( viewing distance ). The viewing distance is the range of distances
where the piece functions properly. If you are outside the viewing
range, the piece seems to roll, or you may see more then one image
at a time. The viewing distance can be changed by slightly changing
the number used as the LPI in the Lenticular F/X dialog box. Your
viewing distance would be different if you were making a piece that
was designed to be held in your hand ( a viewing distance of 18 inches
) than if you were making a piece that is large and designed to be
viewed from across the room ( a viewing distance of 10 to 20 feet
). |