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

專利號(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
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 values of Xf, Yf, and Zf (tristimulus values of the foreground color) for calculating the final overprint prediction values in the above Equations (1) to (3) are obtained using the spot color 2 chart (step S930). Specifically, the values of Xf, Yf, and Zf are obtained by colorimetry of the patch PA92 (see FIG. 20) in the spot color 2 chart.

Finally, the values obtained in steps S910 to S930 are substituted into the above Equations (1) to (3), whereby the tristimulus values X, Y, and Z as overprint prediction values are calculated (step S940). This corresponds to, for example, calculating, as the value of K, the ordinate value of the straight line L91 in FIG. 22 when the abscissa indicates the product of “Xb calculated in step S920” and “Xf calculated in step S930”.

權(quán)利要求

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