1. A method of calculating a halo quantity, comprising: a. analyzing a pattern of color patches received by a device; b. determining an area of a patch unaffected by halo within the pattern of color patches; c. determining a reference value using the area of the patch unaffected by halo, wherein the area of the patch unaffected by halo is related to a size of filter generating halo artifacts; d. determining an artifact value; and e. calculating the halo quantity using the reference value and the artifact value, wherein determining the area, determining the reference value, determining the artifact value, and calculating the halo quantity are performed by a program stored within a memory in the device.