Method and apparatus for producing a warped image from an input image. Image warp data encoded as an image on a card is read by a data reader in a camera. Each element of the warp map maps a corresponding region in an input image to a pixel location of the output image. The warp map is scaled to the dimensions of the output image so as to produce a scaled warp map, then each element in the scaled warp map is used to determine a contribution region in the input image by using a value corresponding to that element and values corresponding to adjacent elements. An output image color for a pixel of the output image that corresponds to the element of the contribution region is then produced.