1. A computer-implemented method comprising: determining at least two counterfeit identification performance attribute (CIPA) sensitivities to changes in resolution of an image for a set of respective features of the image; selecting a selected feature from the set of features for use in determining whether the image on a sample is a counterfeit based upon a comparison of the CIPAs at a resolution; and determining whether the image on the sample is a counterfeit using the selected feature.