Method of generating halftone threshold data
AssigneeFuji Photo Film Co., Ltd.
InventorYoshiaki Inoue
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Abstract
Dot cells are made up of halftone threshold data of color images of C, M, Y, K. At least the dot cells of color images of C, M, K are set under the condition of a non-rational tangent. Halftone screen periods and screen angles of said three color images of C, M, K are set such that a period and an angle of a primary moiré pattern produced when two of the three color images of C, M, K are superposed are substantially equal to a halftone screen period and a screen angle of the remaining one of the three color images of C, M, K. A halftone image is generated using dot cells thus produced.
Claims7
A method of generating halftone threshold data for color images of C, M, Y, K to reproduce a color image, comprising the steps of:
- setting dot cells made up of the halftone threshold data under output conditions including an output resolution of 2000 dpi or less and an output resolution/halftone screen period ratio to 8 dpi/lpi or less;
- setting the dot cells of at least the three color images of C, M, K under the condition of a non-rational tangent;
- and
- setting halftone screen periods and screen angles of said three color images of C, M, K such that a period and an angle of a primary moiré pattern produced when two of the three color images of C, M, K are superposed are substantially equal to a halftone screen period and a screen angle of the remaining one of the three color images of C, M, K.
Dependencies are inferred from the claim text.