In this comparison, the best Viking image has been enlarged to 3.3 times its original resolution, and the MOC image has been decreased by a similar 3.3 times, creating images of roughly the same size. The left image is a portion of the old Viking image, the middle image is a portion of the new MOC frame shown normally, and the right image is the same but with the contrast reversed. Courtesy of Malin Space Science Systems, where the originals for this comparison can be found.

출처http://www.artbell.com