Method for screening color separations of a lenticular image, computer program product and method for producing a lenticular image on a printing material

A method for screening color separations of a lenticular image having a lenticular frequency of lenticular lenses required for viewing the lenticular image and having a lens width l, the method comprising the following steps:

• calculating an amplitude-modulated halftone image for each color separation at least at one screen angle having a tangent being a rational number and with at least one screen frequency;
• providing a screen with non-orthogonal screen cells spanned by vectors u and v for at least one specific color separation of the color separations;
• defining a distance k;
• defining directions of the vectors u and v relating to a perpendicular direction with respect to image strips of the lenticular image for the specific color separation;
• defining a first pair of rational numbers (n, m);
• defining a second pair of rational numbers (i, j);
• and
• satisfying a system of equations:
• n*ux+m*vx=0, n*uy+m*vy=1, i*ux−j*vx=k and i*uy−j*vy=0
• for vectors u=(ux, uy) and v=(vx, vy) spanning the screen cells.