1. A method for ranking pixels in an image by degrees of saliency, the method comprising the steps of: a) defining ( 200, 210 ) a plurality of regions for each of a plurality of pixels in an image, wherein each of said regions, for any one of said pixels at coordinates (x,y), has a different scale s; b) calculating ( 230 ) an entropy value for each of said regions; c) identifying ( 260 ) any peak entropy regions, the peak entropy regions being regions which include a peak entropy value; d) weighting ( 270 ) said peak entropy value of each of said peak entropy regions by a weight value corresponding to a peak width estimate of said peak entropy value; and e) ranking ( 290 ) said regions by said weighted peak entropy values, thereby ranking said pixels.