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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(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.

說明書

In the Deshpande et al. method, a color chart as schematically shown in FIG. 20 is used, for example. This color chart is called a “C×F chart”. In the example shown in FIG. 20, the C×F chart is composed of twenty-two patches. The eleven patches in the upper part are patches obtained by printing an ink of a target spot color on a base material such as paper at a dot percentage in increments of 10%. The eleven patches in the lower part are patches obtained by printing an ink of a target spot color on black (black solid) at a dot percentage in increments of 10%. As above, the C×F chart includes a plurality of patches corresponding to ink densities of a plurality of levels. The overprint prediction value is calculated using the value (colorimetry value) obtained by the colorimetry of the patches in the CHF chart described above.

Hereinafter, the Deshpande et al. method will be described in detail with reference to the flowchart in FIG. 21, taking, as an example, calculation of an overprint prediction value in the case where a background color is a spot color at a dot percentage of 40% (referred to as a “spot color 1” for convenience) and a foreground color is another spot color at a dot percentage of 60% (referred to as a “spot color 2” for convenience).

First, the C×F chart is printed using the ink of spot color 1, and further, the C×F chart is printed using the ink of spot color 2 (step S900).

權(quán)利要求

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