A region of interest in the image is determined and for each pixel in each location (x,y) in that region of interest a value hint(x,y) is computed representing the amount of dense tissue below said pixel as h int ⁡ ( x , y ) = 2 μ fat ⁡ ( E ) - μ int ⁡ ( E ) ⁢ ( Log ⁡ ( p ⁡ ( x , y ) ) - Log ⁡ ( p fat ) ) wherein p(x,y) represents the pixel value of a pixel at location (x,y) in said digital mammographic image, pfat is a reference fat pixel value, μfat,μint are the linear attenuation coefficients of fat tissue and dense tissue and E is the mono-energetic energy value of the x-ray source at image recording, whereby E and pfat are derived from said digital mammographic image representation.