Identification of a printing substance load for a print job

A computer program comprising instructions which, when executed by processing circuitry, cause the processing circuitry to:

• receive calibration data, the calibration data indicating an achievable range of colors physically reproducible on a calibration printing surface by a printer for each of a plurality of different printing substance loads, wherein each of the plurality of different printing substance loads provides an indication of a loading of printing substance to be deposited in a color deposition region;
• receive a target range of colors, the target range of colors corresponding to at least a portion of an item for a print job;
• compare for each of the plurality of different printing substance loads the achievable range of reproducible colors and the target range of colors to determine any difference between the target range and the achievable range for each respective printing substance load;
• and
• identify an appropriate printing substance load for the printer based on at least the comparison.