• Lenses per inch - frequency of lenticular sheet or microlens quantity per inch.

  Lenses per inch = 25.4 / Period of lenticular in mm

  Period of lenticular in mm = 25.4 / Lenses per inch

  Although your Lenticular Screen may be stated as being say 25 lenses per inch, the frequency of the lenses in the lenticular sheet is not equal to the frequency quoted precisely. The value you enter into the database will depend on the printer model, the Printer Print Resolution (known as Dots per inch - DPI) and the desired viewing distance used. For each type of lenticular screen you enter into the database, you need to run a pitch test first to determine the precise LPI value of the Lenticular Screen to enter. 
  
  This value for any given lenticular screen will be different for each printer you intend to use. After using Pitch test open the necessary item in the database and change the Lenses per inch value to set the correct number. For example, the frequency of a lenticular sheet is equal to 72.2 lpi for my printer and not 72. The value is likely to be different for your printer. Determine the value using help10.htm and write this value in your database and save the database. Note: if you use another printer later on - you will need to redo the Pitch test again for that printer and enter the new value in the database.
  
  You may ultimately have serveral invocations in the database for the same screen, thus:-
  
  72LPI for HP710 at 600DPI
  72LPI for Epson 1290 at 1440DPI
  72LPI for Lexmark Z738 at 1200DPI
  
  etc.,
  
  The precise LPI value will most probably be different for each Printer and Printer Resolution for the same brand and type of Lenticular Screen. This is normal!
  
  Note: PitchTest.exe is located in the same diectory as PhotoProjector!

• Curvature radius of lenticular, mm - you can calculate it, click the button Calculate.
   
• Thickness of lenticular, mm - is the feature of lenticular sheet, you can find it in technical specification.
   
• Refractive index of lenticular - refractive index of substrate, of which the lenses are constructed. The refractive index is between 1,52 and 1,65. By default this value is equal 1.57. You don't need to set this value with high precision.
   

Optical characteristics of lenticular: a - period of lenticular, t - thickness of lenticular, r - curvature radius of lenticular, n - refractive index of lenticular, a - viewing angle of lenticular

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