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Method and computer program product for predicting spectral characteristics of ink applied to a base material

專利號
US11659131B2
公開日期
2023-05-23
申請人
SCREEN HOLDINGS CO., LTD.（JP Kyoto）
發(fā)明人
Kenichi Yokouchi
IPC分類
H04N1/60; H04N1/54
技術領域
gradation,spectral,prediction,value,color,relational,values,equation,target,obtained
地域： Kyoto

摘要

First relational equations which represent characteristics of respective sample colors are obtained, and for the respective sample colors, prediction values of spectral characteristics of characteristics-acquired gradation values for a prediction target color are obtained using the first relational equations. Difference values between the prediction values and actual measurement values are obtained, and a sample color for which a minimum difference value is obtained is selected as a reference color. A second relational equation that represents characteristics of the reference color is obtained, and a prediction value of spectral characteristics of a prediction target gradation value for the prediction target color is obtained using the second relational equation.

說明書

The overprint coefficients jx and kx are calculated by solving a simultaneous equation consisting of the equation relating to the first calibration point P91 and the equation relating to the second calibration point P92. That is, an equation representing a straight line denoted by reference numeral L91 in FIG. 22 is obtained. The overprint coefficients jy, jz, ky, and kz are similarly calculated.

Although the patches are provided in 10% increments in the C×F chart shown in FIG. 20, an overprint coefficient corresponding to the dot percentage between two patches which are adjacent to each other in the horizontal direction can be obtained on the basis of the colorimetric values obtained by linear interpolation.

Next, the values of Xb, Yb, and Zb (tristimulus values of the background color) for calculating final overprint prediction values in the above Equations (1) to (3) are obtained using the C×F chart printed using the ink of spot color 1 (referred to as “spot color 1 chart” for convenience) (step S920). Specifically, the values of Xb, Yb, and Zb are obtained by colorimetry of the patch PA95 (see FIG. 20) in the spot color 1 chart.

權利要求

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