Method for screening color separations of a lenticular image and method for producing a lenticular image on a printing material

A non-transitory computer-readable medium having computer-executable instructions to be executed on a computer and performing a method for screening color separations of a lenticular image with a lenticular frequency of lenticular lenses needed for viewing the lenticular image, which method comprises the steps of:

• calculating an amplitude-modulated halftone image for each of the color separations at a screen angle and at a screen frequency, a tangent of the screen angle being a rational number;
• defining the screen angle relating to a direction perpendicular to image strips of the lenticular image for a specific color separation;
• determining a pair of whole numbers (n, m) whose ratio (m/n) is equal to the tangent of the screen angle;
• and
• calculating a screen frequency of a color separation as a product of the lenticular frequency and a square root of a sum of squares of the whole numbers.

A method for producing a lenticular image on a printing material, which comprises the steps of:

• calculating screening color separations of the lenticular image with a lenticular frequency of lenticular lenses needed for viewing the lenticular image, which includes the steps of:
• calculating an amplitude-modulated halftone image for each of the color separations at a screen angle and at a screen frequency, a tangent of the screen angle being a rational number;
• defining the screen angle relating to a direction perpendicular to image strips of the lenticular image for a specific color separation;
• determining a pair of whole numbers (n, m) whose ratio (m/n) is equal to the tangent of the screen angle;
• and
• calculating a screen frequency of a color separation as a product of the lenticular frequency and a square root of a sum of squares of the whole numbers;
• exposing the color separations calculated in each case onto a printing form;
• and
• printing off exposed printing forms in a press via an overprint on a printing material, so that a multicolor lenticular image is produced on the printing material.