methods and apparatus for shifting perspective in a composite image derived from a plurality of images including a first image as a center of projection , and a modified version of a second image that is corrected for perspective distortion relative to the first image . a user input specifies a change in perspective to make the second image the center of projection . in response , a transformation is determined for mapping reference points in the modified version of the second image to reference points in the original , uncorrected second image . the transformation is applied to each of the plurality of images in the composite image , and the transformed images are merged to form a second composite image that has the second image as its center of projection . the methods and apparatus can be implemented as an interactive tool capable of changing perspective based on a single user input .