 The intensity of each pixel is variable.In color imaging systems, a color is typically represented by three or four component intensities such as red, green, and blue, or cyan, magenta, yellow, and black.In some contexts (such as descriptions of camera sensors), "pixel" refers to a single scalar element of a multi-component representation (called a "photosite" in the camera sensor context, although "sensel" is sometimes used), while in yet other contexts it may refer to the set of component intensities for a spatial position.