1. A method for monitoring stitching between printheads in a printing system, the method comprising: (a) capturing one or more images of content printed on a moving print media in at least a stitch boundary to obtain pixel data; (b) averaging the pixel data to produce blur in a media transport direction; (c) determining derivative data of the averaged pixel data; (d) detecting a peak in the derivative data; and (e) determining a type of stitching artifact based on the detected peak in the derivative data.