Patent ID: 8332176

Claim:
A method for correcting measurements obtained using an in-line spectrophotometer in the presence of a banding defect, the method comprising: printing a constant value color patch with a document reproduction system having an ILS color correction system; receiving an ILS data stream in response to said in-line spectrophotometer interacting with said constant value patch; analyzing said ILS data stream to determine a frequency of at least one structured noise component in said document reproduction system that is due to process banding; and adjusting a distance between repeats of a color patch target as a function of a wavelength λ Band of said determined frequency of said at least one structured noise component, such that measurements by said in-line spectrophotometer of said color patch target repeats are synchronized to said banding wavelength, said adjusting comprising: λ Rep =λ Band ·( N+ 1 /K ), where N is an integer and K is the number of repeats.