NASA says the final product you see above isn't a single shot, but a composite of the high-resolution images taken by the NAC and the colored ones taken by the WAC. The LRO, by the way, sees a dozen Earthrises everyday, but it doesn't photograph the view frequently. As we mentioned earlier, the process is quite complicated: the spacecraft has to snap images while it's moving, and while the Earth and the moon are also in motion. Plus, the LRO's cameras concentrate on the moon's surface. It just so happened that in October, the Earth was in the cameras' field of view while they were pointing into space to calibrate, allowing them to capture this stunning view of our planet.
[Image credit: NASA/Goddard/Arizona State University]