1. A method for screening color separations of a lenticular image with a lenticular frequency of lenticular lenses needed for viewing the lenticular image, which 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 the screen frequency of the specific color separation as a product of the lenticular frequency and a square root of a sum of squares of the whole numbers.