1. A method for diagnosing a spectrophotometer, comprising: printing at least one test patch, in proximity to at least one non-printed substrate patch, measuring at least one value characteristic of the at least one printed test patch and the at least one non-printed substrate patch using the spectrophotometer, determining at least one diagnostic score for the spectrophotometer based on the at least one measured value characteristic in comparison with a reference value, wherein the at least one determined diagnostic score comprises a score indicative of at least one of repeatability of measuring the at least one value characteristic using the spectrophotometer and consistency of measuring the at least one value characteristic using the spectrophotometer.