Granted Patent B2

US 7,359,088 · App. 10/688,110 · Granted Apr 15, 2008

Abstract

Claims (60)

1. A method for estimating single or multi-color toner coverage on a printed page, comprising:

receiving image data to be printed;

converting the image data to a contone bitmap;

generating color plane contone bitmaps corresponding to each toner color in the contone bitmap;

calculating pixel coverage value for each of the color plane contone bitmaps;

rendering bitmaps with an appropriate halftone screen corresponding to available toner colors for each color plane contone bitmap;

copying the calculated pixel coverage values onto the rendered bitmaps; and

printing the rendered bitmaps to generate a printed page, wherein the printed page includes the calculated pixel coverage values.

2. The method of claim 1 , wherein calculating pixel coverage value comprises compensating for toner waste.

3. The method of claim 1 , wherein the contone bitmap resolution is less than device resolution.

4. A method for estimating single or multi-color toner coverage on a printed page, comprising:

receiving image data to be printed;

converting the image data to a contone bitmap;

generating color plane contone bitmaps corresponding to each toner color in the contone bitmap;

calculating pixel coverage value for each of the color plane contone bitmaps;

copying the calculated pixel coverage values onto the color plane contone bitmaps;

rendering bitmaps at device resolution and bitdepth with an appropriate halftone screen corresponding to available toner colors for each color plane contone bitmap; and

printing the rendered bitmaps to generate a printed page, wherein the printed page includes the calculated pixel coverage values.

5. The method of claim 4 , wherein calculating pixel coverage value comprises compensating for toner waste.

6. The method of claim 4 , wherein the contone bitmap resolution is less than device resolution.

7. A method for estimating single or multi-color toner coverage on a printed page, comprising:

receiving image data to be printed;

generating color separations for the image data corresponding to available toner colors;

printing each color separation on a separate page;

scanning each printed page comprising the color separations;

calculating toner coverage on each of the scanned printed pages.

8. The method of claim 7 , wherein each printed color separation is printed utilizing black toner.

9. The method of claim 8 , wherein each color separation is printed utilizes a halftone screen corresponding to the color separation.

10. The method of claim 7 , wherein the color separations comprise cyan (C), magenta (M), yellow (Y) and black (K).

11. The method of claim 7 , further comprising generating calibration marks on each of the color separations/printed pages.

12. The method of claim 11 , wherein the calibration marks comprise patches corresponding to 100% coverage, 50% coverage and 0% coverage.

13. The method of claim 12 , wherein the patch corresponding to the 50% coverage is generated utilizing a halftone screen corresponding to the selected color separation.

14. The method of claim 11 , further comprising: calculating a gamma response curve to calibrate the scanned image data with the calibration marks, and calculating an adjusted gray level utilizing the gamma response function.

15. The method of claim 7 , wherein a complimentary color plane is isolated to calculate the corresponding color level.

16. The method of claim 7 , wherein calculating coverage comprises calculating an average gray level for each color separation.

17. The method of claim 7 , further comprising calculating approximate toner usage, wherein toner usage=(sum of adjusted pixel values for the scanned printed page)/(number of pixels on scanned printed page).

18. The method of claim 7 , wherein calculating toner coverage value comprises compensating for toner waste.

19. A system for estimated toner coverage on a printed page, comprising:

a printing apparatus;

an image reading apparatus;

wherein the printing apparatus is configured to generate color separations for an image to be printed, and wherein the color separations correspond to the available toner colors, and further wherein the printing apparatus is configured to print each color separation on a separate page;

and wherein the image reading apparatus is configured to scan each printed color separation and calculate toner coverage.

20. The system of claim 19 , wherein the image reading apparatus generates an image file corresponding to each scanned color separation and the image file is stored on a computer readable medium.

21. A computer program code product, comprising a computer readable medium having computer readable code embodied therein capable of controlling a single or multi-toner printer for estimating toner coverage on a printed page, comprising:

a code portion configured to send instructions to receive image data to be printed;

a code portion configured to convert the received image data to a contone bitmap;

a code portion configured to generate color plane contone bitmaps corresponding to each toner color in the contone bitmap;

a code portion configured to calculate pixel coverage values for each of the generated color plane contone bitmaps;

a code portion configured to render bitmaps at device resolution and bitdepth with an appropriate halftone screen corresponding to available toner colors for the received image data;

a code portion configured to copy the calculated pixel coverage values onto the rendered bitmaps; and

a code portion configured to print the rendered bitmaps to generate a printed page, wherein the printed page includes the calculated pixel coverage values.

22. The computer program code product of claim 21 , wherein the code portion configured to calculate pixel coverage values further comprises compensating for toner waste.

23. A computer program code product, comprising a computer readable medium having computer readable code embodied therein capable of controlling a single or multi-toner printer for estimating toner coverage on a printed page, comprising:

a code portion configured to send instructions to receive image data to be printed;

a code portion configured to convert the received image data to a contone bitmap;

a code portion configured to generate color plane contone bitmaps corresponding to each toner color in the contone bitmap;

a code portion configured to print each color plane contone bitmap on a separate page;

a code portion configured to scan each printed page comprising the color plane contone bitmap; and

a code portion configured to calculate pixel coverage values for each of the scanned printed pages.

24. The computer program product of claim 23 , wherein the code portion configured to calculate pixel coverage values further comprises compensating for toner waste.

Assignments (8)