The purpose of the pitch test is to determine which LPI pitch
matches your particular printer/media/lenticular sheet combination. Since output devices may have slight
differences in variability, you will need to print this target on each
output device you intend to print interlaced images to.
Use FLIP! 2.0 to create this target using the line screen test utility in
the software. With 15lpi material, input 14.94 as your "starting lines per
inch" in the software and set the "print accuracy" to .01.
After printing and allowing proper drying time, place the print on a flat
surface on the floor. Note: Placing the print on a table and looking at it
from arm length is not advisable because you will be inside the proper
viewing distance of greater than 3 feet.
Position the lens material (lens face up) with lenses vertical, over the
print and orient the print vertically under the lens.
After alignment is complete, stand directly over the print (it is OK to
stand on the lens material itself).
Do not let the
fact that the print is not making 100% face contact behind the lens concern
you. You may want to place a few items on the lens to weigh it down if
Standing over the print, you will now see a series of black and white
stripes within each interlaced bar. (see Fig 1.)
Shift your viewing angle left and right. Look at each bar and determine
which bar gives you the widest flip from solid black to white
across the entire width of the printed area. The bar that represents the
best (widest) flip is the proper LPI that you need to interlace your files
to. On 15lpi material, this usually will not vary more than ± .02lpi from