Adjusting colorant values in images to be printed

An apparatus comprising:

• a processing apparatus to:
• receive image data relating to continuous tone values for a plurality of print addressable locations, wherein the continuous tone values are representative of amounts of print agent to be delivered from a plurality of nozzles of a print head to the print addressable locations as the print head travels between the print addressable locations during a printing operation;
• determine, based on the image data, a duration that a nozzle of the plurality of nozzles is to remain idle prior to arriving at a particular print addressable location;
• determine, based on the duration, an adjustment to be applied to the continuous tone value at the particular print addressable location;
• and
• apply the adjustment to obtain an adjusted continuous tone value for the particular print addressable location.

A machine-readable medium comprising instructions which, when executed by a processor, cause the processor to:

• receive a matrix representation of a source image to be printed, the matrix representation defining an ink value for each of a plurality of print addressable locations in the matrix representation, wherein each ink value is representative of an amount of ink to be deposited from a print nozzle onto a print addressable location as the print nozzle moves between the print addressable locations during a printing operation;
• estimate, based on the received matrix representation, an amount of dye enrichment to occur in ink in a particular print nozzle as a result of the particular print nozzle remaining idle for a period of time prior to reaching a given print addressable location;
• calculate, based on the estimated amount, a correction to be applied to the ink value at the given print addressable location;
• and
• apply the correction to the ink value for the given print addressable location.