| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of moire, and also prevent the dislocation of printing position by decomposing a multi-color continuous gradation image in (n) colors, employing aggregate pattern composed by curved image lines of (k)×(n) pieces having specific periodicity, and printing in an allocation of the gradation of each color plate by (k) pieces. SOLUTION: A continuous gradation image is composed in (n) colors of two colors or more, and as a screen expressing the gradation of each color plate of (n) colors, in a formula of y=H(x) sin (F(x)+2πi/(k.n)+G(x) on a rectangular coordinate system (x, y), curved lines of (k)×(n) pieces is used, which are created by substituting integers of 0 to (k)×((n)-1 in (i) successively. However, in the formula, H(x), F(xI, G(x) are arbitrary functions taking (x) as a variable, (k) is an arbitrary integer of 1 or more, and (n) shows an integer of 2 or more. Also, in a screen of (n) color plates, by allocating each (k) piece among respective curved lines of (k)×(n) without being overlapped to be reflected in the image line breadth of curved lines of (k) pieces, the gradation of each color plate of (n) colors is expressed.
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