Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for receiving an image file including image data corresponding to a digital image, the digital image being provided in a first space, and projecting the digital image using a non-linear invertible map projection to generate a projected image, the projected image being provided in a second space, projecting the digital image is achieved by: dividing the digital image into segments, scaling each segment to provide modified segments, and generating the projected image using the modified segments.