METHOD FOR CONTROLLING A COLOR PRINTER OR A COLOR COPIER
1 Assignment
0 Petitions
Accused Products
Abstract
In a method to control a color printer or color copier, a color separation of a first color and a color separation of a second color are applied to a printing substrate to generate a print image. Also, with aid of a printing unit, at least a first control field is printed on the printing substrate. The first control field has a predetermined pattern that includes at least the first color and the second color and is designed such that a color value of the first control field changes depending on a registration error between the first and the second color separations. A reference field is also printed on the printing substrate, a pattern of the reference field being predetermined such that it has a same color value independent of the registration error. The color value of the first control field is measured with a color value sensor. The color value of the reference field is also measured with the color value sensor and a desired color value is determined depending on the color value of the reference field. A deviation between the measured color value of the first control field and the desired color value is determined, the deviation corresponding to a spatial shift of the color separations. At least one control signal is generated to reduce the spatial shift depending on the determined deviation.
13 Citations
21 Claims
-
1-10. -10. (canceled)
-
11. A method to control a color printer or color copier, comprising the steps of:
-
applying a color separation of a first color and a color separation of a second color to a printing substrate to be printed to in order to generate a print image; also, with aid of a printing unit, printing at least a first control field on the printing substrate, wherein the first control field has a predetermined pattern that includes at least the first color and the second color and is designed such that a color value of the first control field changes depending on a registration error between the first and the second color separations; also printing a reference field on the printing substrate, a pattern of said reference field being predetermined such that it has a same color value independent of the registration error; measuring the color value of the first control field with aid of a color value sensor; also measuring the color value of the reference field with aid of the color value sensor and determining a desired color value depending on the color value of the reference field; determining a deviation between the measured color value of the first control field and the desired color value, the deviation corresponding to a spatial shift of the color separations; and generating at least one control signal to reduce said spatial shift of the color separations depending on the determined deviation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method to control a color printer or color copier, comprising the steps of:
-
applying a color separation of a first color and a color separation of a second color to a printing substrate to be printed to in order to generate a print image; also, with aid of a printing unit, printing at least a first control field on the printing substrate, wherein the first control field has a predetermined pattern that includes at least the first color and the second color and is designed such that a color value of the first control field changes depending on a registration error between the first and the second color separations; also printing a reference field on the printing substrate, a pattern of said reference field being predetermined such that it has a same color value independent of the registration error; measuring the color value of the first control field; also measuring the color value of the reference field and determining a desired color value depending on the color value of the reference field; determining a deviation between the measured color value of the first control field and the desired color value, the deviation corresponding to a spatial shift of the color separations; and generating at least one control signal to reduce said spatial shift of the color separations depending on the determined deviation.
-
Specification