公开(公告)号：US4472736A

公开(公告)日：1984-09-18

申请号：US278460

申请日：1981-06-29

申请人： Hideki Ushio ,  Hisao Akiguchi ,  Shigeru Kassu ,  Renji Otake

发明人： Hideki Ushio ,  Hisao Akiguchi ,  Shigeru Kassu ,  Renji Otake

IPC分类号： H04N1/407 ,  H04N1/60 ,  H04N1/46

CPC分类号： H04N1/407 ,  H04N1/60 ,  H04N1/6027

摘要： An original to be lithographically reproduced is classified according to density distribution into one of a plurality of classes established on the basis of various high quality standard printed reproductions by comparing the density distribution patterns of the original and the standard reproductions. The patterns indicate relative frequency of density values in the entire density range. After being classified, the original is reproduced utilizing a standard color separation tone curve for a scanner that corresponds to the compared and selected standard reproduction. Alternatively a reference tone curve based on a grey scale may be used with a correction according to the difference between the reference tone curve and the standard tone curve. Also the reference tone curve may be corrected with the difference between the original density distribution pattern and the selected standard density distribution pattern.An apparatus for use in the processes is also disclosed.

摘要翻译： 通过比较原始和标准复制品的密度分布模式，将根据密度分布分类为基于各种高质量标准印刷复制品建立的多个类别中的原件。 这些图案表示在整个密度范围内的密度值的相对频率。 被分类后，利用对应于比较和选择的标准再现的扫描仪的标准色彩分离色调曲线再现原件。 或者，可以使用基于灰度的参考色调曲线，根据参考色调曲线和标准色调曲线之间的差异进行校正。 此外，可以用原始密度分布图案和所选择的标准密度分布图案之间的差异来校正参考色调曲线。 还公开了用于该方法的装置。