Halftone independent color drift correction

摘要

A method for compensating for color drift in a printer includes determining (Figure 5A) a first true tone response curve for a color channel when said printer is in a first state. A first estimated tone response curve for the color channel is also determined when said printer is in the first state. A second estimated tone response curve for the color channel is determined when the printer is in a second, color-drifted state relative to the first state. A second true tone response curve for the color channel is mathematically predicted (Figure 5B) using the first true tone response curve, the first estimated tone response curve, and the second estimated tone response curve. The first and second estimated tone response curves are estimated using a 2x2 printer model. A printing apparatus includes an image processing unit for implementing the color-drift correction process.