The Colorimetric Effect of the Selection of Printing Inks and Photographic Filters on the Quality of Multicolor Reproductions.

The colorimetric conditions to be imposed on the inks and color filters for process printing are: (1) that the color get defined by the primaries must be as large as possible without omitting any important shades; and (2) that the filters must satisfy the Matching Condition and the Luther-Ives Condition. The Matching Condition concerns the relationship between inks and corresponding filters; the Luther-Ives Condition concerns the shape of the filter curves which must be adapted to the sensitivities of the human eye (color mixture curves). Both conditions cannot be satisfied at the same time.