1. A method comprising: under control of one or more processors configured with executable instructions, determining a first intrapersonal setting of at least a portion of a first input image; determining a second intrapersonal setting of at least a portion of a second image; determining, based at least in part on a threshold for a difference between the first intrapersonal setting and the second intrapersonal setting, whether the first input image and the second image are comparable with each other for direct appearance matching; and in response to determining that the first input image and the second image are not comparable with each other for direct appearance matching: identifying a plurality of images of an identity data set that are associated with a different identity than an identity associated with the first input image; identifying a nearest match between the at least the portion of the first input image and at least a portion of a first generic image of the plurality of images, wherein the first generic image is associated with a generic identity; transforming the first input image into a third image by substituting at least a portion of a second generic image of the plurality of images with the at least the portion of the first input image, wherein the second generic image is associated with the generic identity; and performing direct appearance matching between the second image and the third image.