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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

According to the invention disclosed in Japanese Laid-Open Patent Publication No. 2020-159821, spectral reflectances of a halftone patch can be predicted if the spectral reflectances of the solid patch for the prediction target color are obtained. Hence, without printing the C×F chart, it will be possible to obtain prediction values of spectral reflectances of a halftone patch when it is assumed that the C×F chart is printed. However, actually, the spectral reflectances of the halftone patch are sometimes obtained by color marks and the like. That is, for some halftone patches, calorimetric values are sometimes obtained without printing the C×F chart. In this case, regarding each of the halftone patches for which the colorimetric values are obtained, there is an error between actual measurement values (the colorimetric values) and prediction values. Accordingly, for example, in a case in which colorimetric values corresponding to a patch with a dot percentage of 50% are obtained, then as illustrated in FIG. 23, a color based on the actual measurement values and a color based on the prediction values mismatches largely with each other in terms of a relationship. In this regard, it is conceivable that, if there is a halftone patch with known colorimetric values, prediction accuracy improves using information on the calorimetric values.

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