Patent ID: 8477372

Claim:
A method for updating an image quality metric database, the method comprising: performing at a first time: measuring a defined image quality metric for a set of device-dependent colorant specifications; storing said measured image quality metric to a database; deriving a first model based upon said measurements obtained for the defined image quality metric, corresponding to a subset of said device-dependent colorant specifications; using the first model to obtain first model-predicted values for the defined image quality metric at the set of device-dependent colorant specifications; determining an error term at each of said set of device-dependent colorant specifications for said defined image quality metric, said error term being a difference between said measured image quality metric and said first model-predicted values; and storing said set of error terms to said database; and performing at a second time: measuring said defined image quality metric for said subset of device-dependent colorant specifications; deriving a second model based upon these measurements performed at said second time; using said second model to obtain second model-predicted values for said defined image quality metric; adding said set of error terms to said second model-predicted values to produce modified model-predicted values; and updating said database with said modified model-predicted values.