Patent ID: 8154559

Claim:
A method of mapping, in a color space, source colors of a source color device into target colors of a target color device, said method comprising steps of: mapping each said source color into a corresponding said target color along a mapping trajectory that is anchored to an anchor point, wherein there is at least one mapping plane comprising different anchor points and different mapping trajectories that do not intersect one with another except, possibly, at one of said anchor points, wherein said at least one mapping plane is partitioned into a plurality of different parts comprising a first part, a second part and a third part such that said second part is positioned between said first and third parts, and further wherein variable anchor points are used in said second part and fixed anchor points are used in said first and third parts; and defining said different mapping trajectories in said at least one mapping plane such that, in said at least one mapping plane, a uniformity testing curve different from an achromatic axis can be found that intersects all of said different mapping trajectories such that a function defined by a variation, along said uniformity testing curve, of gradients of said different mapping trajectories at said intersections is continuous, and such that a first derivation of said function along said uniformity testing curve is also continuous.