Patent ID: 7864373

Claim:
A method of calibrating or characterizing a printing system with respect to at least one color, the method comprising: providing a set of spline basis functions as a vector [S]; providing a measured toner reproduction curve (TRC) including a plurality of measured density values associated with a plurality of input density values for the at least one color, the plurality of input density values selected from values of a machine TRC for the at least one color; deriving a matrix [X] of weighting coefficients for the spline basis functions by determining a least-squares solution for the matrix equation [measured TRC]=[X]*[S]; constructing a spline fitted TRC based on the spline basis functions and the matrix [X] of weighting coefficients; forming a binary dot file based at least in part on the spline fitted TRC; and loading the binary dot file into the printing system for use in printing.