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

專(zhuān)利號(hào)
US11659131B2
公開(kāi)日期
2023-05-23
申請(qǐng)人
SCREEN HOLDINGS CO., LTD.（JP Kyoto）
發(fā)明人
Kenichi Yokouchi
IPC分類(lèi)
H04N1/60; H04N1/54
技術(shù)領(lǐng)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(shuō)明書(shū)

Next, the overprint coefficients jx, jy, jz, kx, ky, and kz of the above Equations (1) to (3) regarding the spot color 2 are calculated using the C×F chart printed using the ink of spot color 2 (referred to as “spot color 2 chart” for convenience) (step S910). In this regard, focusing on the above Equation (1), for example, the practical maximum value and the minimum value for Xb×Xf are values obtained by the ink of the spot color 2 being applied on the base material and black (black solid), respectively. The same applies to Yb×Yf and Zb×Zf. Therefore, in order to calculate the overprint coefficient, in a coordinate system representing the above Equations (1) to (3) (see FIG. 22. Note that FIG. 22 shows only the coordinate system representing the above Equation (1)), the coordinates representing the stimulus value of a state where the ink of the spot color 2 at a dot percentage of 60% is applied on black are defined as a first calibration point P91, and the coordinates representing the stimulus value of a state where the ink of the spot color 2 at a dot percentage of 60% is applied on the base material are defined as a second calibration point P92.

權(quán)利要求

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