WHAT IS SPATIAL RESOLUTION?
Spatial resolution is defined as the area of ground represented by one pixel on the computer screen, or by one halide grain on the film. Pixel size is controlled by the optical characteristics of the sensor. The grain size is dependent on the film speed, and the slower the film, the better the resolution. Also, black & white film tends to have better resolution than color film. Spatial resolution of the image is very important when choosing the best source for a given application.