1. A method of determining pixel dropout of a printhead that has a plurality of print elements arrayed along a first axis, comprising: a) using a mechanical image capture device to capture an image of printing on a retransfer film, the printing is printed on the retransfer film using the printhead; b) inputting the captured image of the printing into a processing device and using the processing device to generate a dataset of integrated intensity values, in a printing direction, of the captured image of the printing; and c) using the dataset to determine if pixel dropout has occurred, including using the processing device to compare the dataset generated from the captured image of the printing to an expected dataset generated from print data used to generate the printing on the retransfer film.