First, the inking behavior of the printing units of a multicolor rotary
printing machine is determined by means of test forms. The inking
nonuniformities on the test forms are transmitted to the pre-press stage.
Using the data about the inking nonuniformities of the test forms, the
raster tonal values of the color separations of a printing form are
modified in such a way that the inking nonuniformities are compensated
locally on the basis of the location of their occurrence in the print on
the printing forms or films.
