1. A computer implemented method of creating a color look-up-table for use by an imaging system which uses a resource to display an image and provides an attribute of the image, the method comprising: a) selecting a threshold value of resource usage and metric of the attribute by the imaging system; b) accessing a predetermined color look-up-table representing a mapping of color values of a first color gamut to color values displayable by the imaging system, the predetermined color look-up-table having nodes defining colors to be displayed for the color values; c) comparing the resource usage and attribute values associated with the nodes to the threshold value and thereby determining the set of nodes of the predetermined look-up-table having a resource usage and attribute value less than the threshold value; and d) creating a further look-up-table which maps the said color values of the first color gamut to the said set of nodes.