1. A computerized method of controlling a quality measure in a compression quality evaluation system, the method comprising: calculating a grain value indicative of an extent of grain present in an input image, said grain value being calculated based on one or more features characterizing a base image related to the input image; and configuring the quality measure upon a grain criterion being met by said grain value, the quality measure being indicative of perceptual quality of a compressed image compressed from the input image.