1. A method for color density correction in a printing system that includes a linehead that jets ink onto a moving print media and an integrated imaging system that captures images of content printed on the moving print media, wherein the linehead includes one or more printheads, the method comprising: producing one or more pixel data values and a measured density value trace for a printed test block by scanning the test block and averaging pixel data in a print media transport direction; determining a color and a density of the ink in the printed test block using the pixel data values; comparing the measured density value trace with a respective reference density value; determining whether there is a difference between the measured density value trace and a reference density value; and if there is a difference, adjusting ink laydown for the printhead based on the difference.