1. Method of forming a color selection including selected color points, the method comprising: providing a first cluster in a color space, the cluster being associated to a first color representation system; providing a second cluster in the color space, the cluster being associated to a second color representation system, whereby the second cluster differs from the first cluster; providing a reference cluster in the color space; providing a predetermined color point in the color space that is not included in the reference cluster; forming, using a processing system, the color selection that includes at least a first selected color point and a second selected color point, the first selected color point being the point of the first cluster which among all points of the first cluster is closest to the predetermined color point and the second selected color point being the point of the second cluster which among all points of the of the second cluster is closest to the predetermined color point; and evaluating using the processing system, for at least one selected color point, a distance to reference which separates the selected color point from a point of the reference cluster closest to the selected color point.