A digital image is made up of hundreds of thousands or even millions of tiny dots called pixels (short for picture elements). The resolution of the camera's sensor is the number of pixels horizontally multiplied by the number of pixels vertically. The more pixels the sensor has, the sharper and more detailed the picture. Resolution may range from1,280x960 pixels (1-megapixel model) to as much as 2,048x1,536. (3-megapixel model) While desirable, high resolution is expensive and requires much more memory per picture.