Granted Patent B2

US 7,233,397 · App. 10/744,207 · Granted Jun 19, 2007

Abstract

Claims (17)

1. A system for characterizing color variations in a color output device, the system comprising:

an image file comprising a set of similar color patches, the image file adapted to be printed on the color output device;

a measurement device for determining colorimetric values for each printed color patch; and

a processor adapted to calculate a standard deviation value for each of the colorimetric values, and a numerical value that is a function of the standard deviation values and that represents a colorimetric characterization of color deviation of the set.

2. The system of claim 1 , wherein the color output device is a color printer.

3. The system of claim 1 , wherein the color output device is a color copier.

4. The system of claim 1 , wherein the color output device is a color printing press.

5. The system of claim 1 , wherein the color patches comprise predetermined percentages of cyan, magenta, yellow and black colorants.

6. The system of claim 1 , wherein the set of similar color patches are printed on an output page.

7. The system of claim 1 , wherein the set of similar color patches are printed on a plurality of output pages.

8. The system of claim 1 , wherein the colorimetric values comprise L, a and b values.

9. The system of claim 1 , wherein the colorimetric values comprise X, Y and Z values.

10. The system of claim 1 , wherein the measuring device comprises a colorimeter.

11. The system of claim 1 , wherein the measuring device comprises a spectrophotometer.

12. The system of claim 1 , wherein the measuring device comprises a spectrocolorimeter.

13. The system of claim 1 , wherein the function comprises a sum of squares of the standard deviation values.

14. The system of claim 1 , wherein the function comprises a square root of a sum of squares of the standard deviation values.

Assignments (9)