Patent ID: 7980650

Claim:
A system for removing a light sensor artifact from reflectance measurements comprising: a print head for ejecting a plurality of pixels having a first single color in a test pattern onto an image substrate; a light source for illuminating the test pattern on the image substrate with a light; a light sensor configured to generate a reflectance measurement for a first portion of the test pattern with reference to a light having a color that is non-complementary to the first single color of the test pattern, to generate a reflectance measurement for the first portion of the test pattern with reference to a light having a color that is complementary to the first single color of the test pattern, and to generate a reflectance measurement for a second portion of the test pattern with reference to the light having a color that is complementary to the first single color of the test pattern, the second portion including an area that overlaps the first portion of the test pattern; and a sensor controller operatively connected to the light sensor and configured to scale the reflectance measurement of the first portion generated with reference to the light having a color that is non-complementary to the first single color of the test pattern to minimize a difference between the reflectance measurement of the first portion generated with reference to the light having a color that is complementary to the first single color of the test pattern and the reflectance measurement of the second portion generated with reference to the light having a color that is complementary to the first single color of the test pattern in the overlapped area.