A method for providing an output image based on an input image, the method comprising determining a location of an output pixel with respect to an input image, determining values of elements of a filter array such that the effective width of the filter array depends on the density of exposed input pixels within the input image, and determining the value of the output pixel by performing a sum-of-products operation between non-zero values of the elements of the filter array and the values of input pixels of the input image located at respective positions, when the filter array is superimposed on the input image such that the center of the filter array corresponds to the location of the output pixel.