One thing to watch with digital, is that many cameras count EACH color site as a pixel, and it takes three color sites (Red, Green, Blue) to display the picture element in full color.(posted 8947 days ago)So in digital pixels, you need to divide the number of pixels by 3 to get the actual number of information "spots".
This is sort of like counting the number of grains in each of the three color layers of a piece of color film, and reporting that as "pixels."