Method for printing a visual printer calibration test pattern

• US 20060126135A1
• Filed: 12/14/2004
• Published: 06/15/2006
• Est. Priority Date: 12/14/2004
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Lester, Audrey A., Stevens, Michael D.
• Granted Patent: US 7,511,858 B2
• Time in Patent Office: Days
• US Class Current: 358/504
• CPC Class Codes: H04N 1/6033 using test pattern analysis H04N1/6055 takes precedence

Abstract

A method of printing a test pattern including printing cyan or magenta in a test region using a default printer half-tone, printing a yellow in a reference area portion of the test region using a coarse clustered dot half-tone, and printing different levels of yellow in test patch regions of the test region using a default printer half-tone.

Claims

1. A method of printing a test pattern, comprising:

printing a test pattern region with a predetermined substantially constant level of cyan using a default printer cyan half-tone;

printing a reference area portion of the test pattern region with a predetermined substantially constant level of yellow using a clustered dot yellow half-tone;

printing test patch portions of the test pattern region with respectively different substantially constant levels of yellow using a default printer yellow half-tone, wherein the default printer yellow half-tone has a frequency that is higher than the frequency of the clustered dot yellow half-tone, and whereby each test patch portion includes yellow printed at a respective substantially constant level.

2. The method of claim 1 wherein:

printing a test pattern region with a predetermined substantially constant level of cyan comprises electrophotographically printing a test pattern region with a predetermined substantially constant level of cyan using a default printer cyan half-tone;

printing a reference area portion of the test pattern region with a predetermined substantially constant level of yellow comprises electrophotographically printing a reference area portion of the test pattern region with a predetermined substantially constant level of yellow using a clustered dot yellow half-tone;

printing test patch portions of the test pattern region with respectively different substantially constant levels of yellow comprises electrophotographically printing test patch portions of the test pattern region with respectively different substantially constant levels of yellow using a default printer yellow half-tone, wherein the default printer yellow half-tone has a frequency that is higher than the frequency of the clustered dot yellow half-tone, and whereby each test patch portion includes yellow printed at a respective substantially constant level.

3. The method of claim 1 wherein the substantially constant level of cyan printed using a default printer half-tone and the substantially constant level of yellow printed using a clustered dot yellow half-tone are substantially equal.

4. The method of claim 1 wherein the default printer cyan half-tone has a higher frequency than the clustered dot yellow half-tone.

5. The method of claim 1 wherein each of the test patch portions is generally fork shaped.

6. A method of printing a test pattern comprising:

printing a test pattern region with a predetermined substantially constant level of magenta using a default printer magenta half-tone;

printing a reference area portion of the test pattern region with a predetermined substantially constant level of yellow using a clustered dot yellow half-tone;

printing test patch portions of the test pattern region with respectively different substantially constant levels of yellow using a default printer yellow half-tone, wherein the default printer yellow half-tone has a frequency that is higher than the frequency of the clustered dot yellow half-tone, and whereby each test patch portion includes yellow printed at a respective substantially constant level.

7. The method of claim 6 wherein:

printing a test pattern region with a predetermined substantially constant level of magenta comprises electrophotographically printing a test pattern region with a predetermined substantially constant level of magenta using a default printer magenta half-tone;

printing a reference area portion of the test pattern region with a predetermined substantially constant level of yellow comprises electrophotographically printing a reference area portion of the test pattern region with a predetermined substantially constant level of yellow using a clustered dot yellow half-tone;

printing test patch portions of the test pattern region with respectively different substantially constant levels of yellow comprises electrophotographically printing test patch portions of the test pattern region with respectively different substantially constant levels of yellow using a default printer yellow half-tone, wherein the default printer yellow half-tone has a frequency that is higher than the frequency of the clustered dot yellow half-tone, and whereby each test patch portion includes yellow printed at a respective substantially constant level.

8. The method of claim 6 wherein the substantially constant level of magenta printed using a default printer half-tone and the substantially constant level of yellow printed using a clustered dot yellow half-tone are substantially equal.

9. The method of claim 6 wherein the default printer magenta half-tone has a higher frequency than the clustered dot yellow half-tone.

10. The method of claim 6 wherein each of the test patch portions is generally fork shaped.

11. A method of calibrating a printer comprising:

printing a plurality of green test patterns using cyan and yellow, wherein each test pattern includes a green reference area and a plurality of green test patches of different hues of green, and wherein the green reference area and the green test patches include cyan printed at a substantially constant level using a default printer cyan half-tone, wherein the green reference area further includes yellow printed at a substantially constant level using a clustered dot yellow half-tone, wherein the default printer yellow half-tone has a higher frequency than the clustered dot yellow half-tone, and wherein green test patches include yellow printed at respectively different substantially constant levels of yellow using a default printer yellow half-tone;

receiving inputs from a user as to which test patch most closely matches a respective reference area;

using the inputs to generate a calibration curve for yellow.

12. A method of calibrating a printer comprising:

printing a plurality of red test patterns using magenta and yellow, wherein each test pattern includes a red reference area and a plurality of red test patches of different hues of red, and wherein the red reference area and the red test patches include magenta printed at a substantially constant level using a default printer magenta half-tone, wherein the red reference area further includes yellow printed at a substantially constant level using a clustered dot yellow half-tone, wherein the default printer yellow half-tone has a higher frequency than the clustered dot yellow half-tone, and wherein red test patches include yellow printed at respectively different substantially constant levels of yellow using a default printer yellow half-tone, and;

receiving inputs from a user as to which test patch most closely matches a respective reference area;

using the inputs to generate a calibration curve for yellow.