System and method for characterizing a printing device
View Patent ↗A method is used for constructing a look up table for characterizing a printing device, and a system therefore, wherein the look up table is an inverse look up table for obtaining for the printing device colorant values in a colorant space as a function of given color values in a color space. The method includes: (a) selecting an axis in the color space; (b) selecting a path in the color space; (c) determining a particular point on the path having a predetermined colorant value; (d) projecting the particular point on the axis, thus obtaining a projected point; and (e) adding the projected point to the look up table as a sampling point.
1. A method for constructing a look up table for characterizing a printing device, wherein said look up table is an inverse look up table for obtaining for said printing device colorant values in a colorant space as a function of given color values in a color space, the method comprising the steps of:
selecting an axis in said color space;
selecting a path in said color space;
determining a particular point on said path having a predetermined colorant value;
projecting said particular point on said axis, thus obtaining a projected point; and
adding said projected point to said look up table as a sampling point.
2. The method according to claim 1 further comprising the steps of:
determining color separation values in said colorant space for a plurality of points on said path; and
using said color separation values in determining said particular point on said path.
3. The method according to claim 1 wherein said predetermined colorant value is selected from a group consisting of a colorant value of an ink changing point of said printing device and a colorant value of a printer model boundary point of said printing device.
4. The method according to claim 3 further comprising the step of:
adding all ink changing points of said printing device to said look up table as sampling points.
5. The method according to claim 1 wherein said path corresponds to a neutral color in said color space.
6. The method according to claim 1 wherein said color space is CIELAB and said axis is CIE L*.
7. The method according to claim 1 wherein said path coincides with said axis.
8. The method according to claim 7 wherein a second axis is selected from a group consisting of CIE a* and CIE b*.
9. The method according to claim 1 further comprising the steps of:
projecting said particular point on a second axis, thus obtaining a second projected point; and
adding said second projected point to said look up table as another sampling point.
10. The method according to claim 1 wherein said printing device is an ink jet printer.
11. A system for constructing a look up table for characterizing a printing device, wherein said look up table is an inverse look up table for obtaining for said printing device colorant values in a colorant space as a function of given color values in a color space, the system comprising:
means for selecting an axis in said color space;
means for selecting a path in said color space;
means for determining a particular point on said path having a predetermined colorant value;
means for projecting said particular point on said axis, thus obtaining a projected point; and
means for adding said projected point to said look up table as a sampling point.
12. The system according to claim 11 further comprising said printing device.
13. A computer-readable medium encoded with a computer program for constructing a look up table for characterizing a printing device, wherein said look up table is an inverse look up table obtaining for said printing device colorant values in a colorant space as a function of given color values in a color space, the computer-readable medium encoded for performing the method of:
selecting an axis in said color space;
selecting a path in said color space;
determining a particular point on said path having a predetermined colorant value;
projecting said particular point on said axis, thus obtaining a projected point; and
adding said projected point to said look up table as a sampling point.
14. A computer readable medium comprising computer executable instruction for constructing a look up table for characterizing a printing device, wherein said look up table is an inverse look up table for obtaining said printing device colorant values in a colorant space as a function of given color values in a color space to carry out the method steps of:
selecting an axis in said color space;
selecting a path in said color space;
determining a particular point on said path having a predetermined colorant value;
projecting said particular point on said axis, thus obtaining a projected point; and
adding said projected point to said look up table as a sampling point.