3-sensor cameras split the incoming light beam into the three colors via a prism, and direct the beams to individual sensors. Therefore, each color has a dedicated sensor. These cameras are often AC-powered because they require three times the power of the typical consumer camera. It s unlikely, as more effective alternatives are being developed. For example, 3-megapixel prosumer cameras now devote a megapixel of sensor area to each color, producing dazzling results while remaining highly portable.
Some cameras simply work faster after the picture is taken than others.
Digital cameras must process every picture before saving it to memory. Some cameras rely on a general CPU to process the image as well as control the flash, focus, and other functions needed to make a camera work. This takes more time than if a dedicated chip is used for image processing. Having one in a camera frees the main CPU for other functions and speeds up the whole picture-taking process. This is a bit like having extra processing in a computer video card to make games and movies play faster.