Printer banding is an important quality issue; and it has been analyzed and assessed by many researchers. However, little literature has focused on the study of the relationship between physically measured banding and perceived banding. In this paper we propose an experimental methodology for assessing banding which is based on the observer's ability to discriminate between images with different levels of banding. We describe our banding measurement technique, and analyze the banding of three monochrome laser printers. We also conduct psychophysical experiments using the method of constant stimuli. Our results show that theWeber fraction for discriminating banding is statistically constant over the printers despite differences in the spectral content of the banding associated with each printer. This suggests that banding discrimination is similar to many other perceptual phenomena (Weber's law holds).