1. A method of displaying or recording an image showing enhanced detail relative to an original image or record comprising: (a) making a point by point record of the original image by scanning it in a manner to select successive pixels in a logical array, (b) storing the pixel values in such a way and for such a period that a window comprising a sub-array of adjacent pixels can be selected and analysed statistically said window comprising between 5 and 225 pixels, (c) analyse the pixel values of the window surrounding each pixel in turn to give the average value D and the standard deviation .sigma., (d) processing the central fixed value D.sub.c to give an improved value D'.sub.c such that EQU D.sub.c '=kD.sub.c +(1-k)D wherein k is a variable having a value between 0 and 0.99 which varies from pixel to pixel based on the value of .sigma., said value of k being related monotonically to .sigma. in such a way as to have an upper and lower bound within the said range 0 to 0.99, (e) displaying or recording the enhanced image based on the derived values D.sub.c '.