Color calibration

A method of calibrating a printing system, comprising:

• printing, with the printing system, a plurality of test patches corresponding to a set of initial color sample points and a set of test colors;
• measuring color properties of the printed plurality of test patches, the measured color properties comprising color properties for the set of initial color sample points and color properties for the set of test colors;
• selecting, using the color properties for the set of test colors, a gamut descriptor from a plurality of predefined gamut descriptors, each gamut descriptor of the plurality of predefined gamut descriptors defining a set of up-sampling parameters for a particular color gamut;
• up-sampling, using the set of up-sampling parameters of the selected gamut descriptor, the color properties for the set of initial color sample points to generate up-sampled data;
• and
• generating, using the up-sampled data, a color mapping to be applied to print job data received by the printing system.

A non-transitory computer-readable storage medium comprising computer-readable instructions that upon execution cause a system comprising a processor to:

• receive measured color data indicating measured color properties of a plurality of printed patches, the printed patches corresponding to a set of initial color nodes and a set of selection color nodes, the measured color properties comprising color properties for the set of initial color nodes and color properties for the set of selection color nodes;
• select, using the color properties for the set of selection color nodes, a gamut descriptor from a plurality of predefined gamut descriptors, each gamut descriptor of the plurality of predefined gamut descriptors defining a set of upscaling parameters associated with a particular color gamut;
• upscale, using the set of upscaling parameters of the selected gamut descriptor, the color properties for the set of initial color nodes to generate upscaled data;
• and
• generate, using the upscaled data, a calibration look-up table to be used to color calibrate a printing system.