1. A method comprising: displaying a target image on an output of a computing device; displaying a template image on the output of the computing device, wherein the displayed template image is oriented with respect to the displayed target image; based on received input, adjusting at least a scale of the displayed template image so that the adjusted displayed template image substantially fits part of the displayed target image; selecting a physical template size from a discrete range of physical template sizes, wherein, out of the physical template sizes in the discrete range, a physical template of the selected physical template size is a closest match to the adjusted scale; and displaying a representation of the selected physical template size on the output of the computing device.