1. A method for identifying a linehead that is producing an artifact in content printed on a moving print media in a printing module that includes a plurality of lineheads, wherein a printing system includes one or more printing modules, the method comprising: (a) capturing an image of the content as the print media is moving to obtain pixel data and averaging the pixel data to produce blur in a direction the print media is moving; (b) determining whether the averaged pixel data is associated with content printed by a first linehead in the printing module; (c) if the averaged pixel data is not associated with the content printed by the first linehead, subtracting averaged pixel data from an image captured by a preceding linehead from the averaged pixel data in the image to produce averaged pixel data that is associated with a single linehead; (d) determining derivative data of the averaged pixel data; (e) determining whether one or more peaks are present in the derivative data; and (f) if one or more peaks are present in the derivative data, identifying the linehead that is producing the artifact based on the one or more peaks.