1. A method for correcting images comprising: receiving information identifying a unique subject in a current image, the current image including a plurality of pixels; determining a current pixel characteristic using a subset of pixels from the unique subject in the current image; receiving a reference pixel characteristic for the unique subject; inferring a systemic error of the current image by comparing the current pixel characteristic with the reference pixel characteristic; and correcting pixel characteristics of a correction subset of the current image based, at least in part, on the inferred systemic error, the correction subset being a subset of the plurality of pixels.