This disclosure relates to a method, apparatus, and system for determining image quality of a printer or similar image forming device. A first graphic pattern and a second graphic pattern may be printed on sets of N≥1 test pages. The second graphic pattern may have the same colorant coverage as the first graphic pattern, though the two patterns may have different orientations and different locations on the page. The patterns may partially overlap in page location. Total colorant coverage may be compared between the set of N first test pages and the set of N second test pages. If the colorant coverage is different between the sets, the image forming device may be assigned an abnormal operating status.