| 摘要 |
<p>Halftone-dot area percentage data (ai) generated from an image document (2) for at least three plates including three primaries are converted into respective bit map data (bi) with referring to respective threshold matrix (14). The bit map data (bi) are simultaneously referred to with respect to each of the pixels of a color printer (3) which is to output a color proof (CPb), and thereby the area percentages (ci) are counted. Then, predetermined colorimetric data (Xi, Yi, Zi) of the respective colors are processed by the area percentages (ci) as weighting coefficients, and the average tristimulus value data (X, Y, Z) are calculated. The calculated tristimulus value data (X, Y, Z) are used as pixel data of input image data of the color printer (3). <IMAGE></p> |
