Because of askvictor's point. Logging every single pixel value would suck down battery life equivalent to recording your screen every moment it is on. If you

Because of askvictor's point. Logging every single pixel value would suck down battery life equivalent to recording your screen every moment it is on. If you stored cumulative pixel activations in an array (like I would think of doing), you are going to overflow an integer value very quickly, or run into floating point issues. If you stored it as a video or in a DB, you are going to have weeks worth of video that need stored.