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A pitch test is nothing more than a calibration tool.  It calibrates the printer, media and lenticular sheet used for a particular image.  Knowing how to perform a pitch test properly is the one of the most important steps in creating a GREAT lenticular image.  Most interlacing software packages have the capability to print a pitch test.  It may be located in a 'Utilities' or 'Tools' menu and could be called by a different name.  The procedure below is a general procedure that should help you create and use a pitch test.


Step 1:

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.


Step 2:

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.


Step 3:

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.


Step 4:

Position the lens material (lens face up) with lenses vertical, over the print and orient the print vertically under the lens.


Step 5:

After alignment is complete, stand directly over the print (it is OK to stand on the lens material itself).


Step 6:

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 necessary.


Step 7:

Standing over the print, you will now see a series of black and white stripes within each interlaced bar. (see Fig 1.)


Step 8:

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 14.98lpi.



Figure 1                        

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