How to use the program:
Pitch Test
Launch PitchTest.exe to determine the frequency of lenticular sheet:
- Starting Lenses per Inch, lpi - starting value of lenticular sheet frequency, this is frequency of top strip;
- Step of Lenses per Inch, lpi - step of frequency increase for next strip;
- Width of strips, cm;
- Hight of strips, cm;
- Gaps between strips, cm;
- Number of strips, cm;
- Print resolution, dpi.
- Background - colour of background: White or Green or Custom (click the rose button to open the palette dialogue).
- Strips defines the width of black strips: Thin - strip in one pixel, Thick - strip in half of period.
- Scaling: Bilinear or By Neighbour interpolation. By Neighbour is used for offset printing.
- TIFF compression. Regrettably, not all graphic software can support LZW, GZIP, Packpits compression method. Make the TIFF file with None, if compressed image is not read in your graphic application.
Choose the necessary print resolution. Set values for Starting Lenses per Inch and Step of Lenses per Inch. The width of the pitch test SHOULD NOT be less than the width of your picture. Change the print settings to use a maximal resolution and a best quality. Print a pitch test. Then dry your print.
Put the printed pitch test sheet under the lenticular screen. You can see the similar picture:
The frequency of the strip which is the most continuous is close to the lenticular sheet frequency.
Close one eye and turn the head to the left, and then to the right. Look at the moire moving. Among the strips there are two strips where moire runs TOWARDS each other: the top moire moves from left to right, the bottom one moves from right to left (or otherwise). These two strips are close up to the necessary strip.
At the beginning set the Step of Lenses per Inch is equal to 0.1 lpi. You determine the lenticular frequency within 0.1 lpi. Next step you set the Step of Lenses per Inch is equal to 0.01 lpi and determine the lenticular frequency within 0.01 lpi. If you make a visiting or a post card, you need to determine the lenticular frequency within 0.1 lpi.