Processing an object for printing

1. A method for processing an object for printing, the object comprising a plurality of properties defined at each of a plurality of locations within the object, each property represented by a metamer set of possible combinations of proportions of at least one of a set of printing materials, the method comprising:

selecting a combination of the metamer sets of a given location of the plurality of locations within the object that provides all of the plurality of properties defined for the given location.

2. The method of claim 1 , wherein selecting a combination of the metamer sets of the given location comprises

if no combination exists that provides all of the plurality of properties defined for the given location, applying user-defined rules associated with each of the metamer sets for the given location to select one of the combinations.

3. The method of claim 2 , wherein selecting a combination of the metamer sets of the given location comprises

if no solution to the applied user-defined rules exists, performing a manual override for the given location.

4. The method of claim 3 , wherein performing a manual override comprises

changing parameters of the object until another combination of metamer sets for the given location can be selected.

5. The method of claim 2 , wherein the method further comprises

if no solution to the applied user-defined rules exists, reporting the input object unfit for printing.

6. The method of claim 1 , wherein the method further comprises

generating control data for printing the object from the selected combination at the given location.

7. An apparatus for processing an object for printing, the object comprising a plurality of properties defined at each of a plurality of locations within the object each property represented by a metamer set of possible combinations of proportions of at least one of a set of printing materials, the apparatus comprising:

a selector to select a combination of the metamer sets for a given location of the plurality of locations within the object that provides all of the plurality of properties defined for the given location.

8. The apparatus of claim 7 , wherein the selector comprises

an identifier to identify the metamer set for each property defined at the given location.

9. The apparatus of claim 8 , wherein the selector further comprises

a selection applicator to select one of the identified metamer sets for a given location within the object that provides all of the plurality of properties defined for the given location.

10. The apparatus of claim 8 , wherein the apparatus further comprises a store to store a plurality of user-defined rules associated with each metamer set, the selection applicator is further to apply the user-defined rules associated with the metamer sets for the given location to select a metamer set for the given location if no metamer set exists that provides all of the plurality of properties defined for the given location.

11. The apparatus of claim 10 , wherein the apparatus further comprises a tagger to tag the given location if no solution to the applied user-defined rules exists for enabling a manual override for the given location.

12. The apparatus of claim 11 , wherein the apparatus further comprises a first interface to present the tagged location to a user for manual override.

13. The apparatus of claim 12 , wherein the apparatus further comprises a second interface to input the manual override.

14. The apparatus of claim 10 , wherein the apparatus further comprises

a generator to generate a report that the input object is unfit for printing if no solution to the applied user-defined rules exists.

15. The apparatus of claim 7 , wherein the apparatus further comprises a generator to generate control data for printing the object from the selected metamer set at the given location.