The method comprises: providing a source image comprising a plurality of pixels, {TAIL ~ each pixel} having a source value, providing an inverted threshold value for each pixel of the plurality of pixels, and generating thereof a temporary image comprising a temporary value for {HEAD ~ each pixel} of the plurality of pixels 
The method comprises : providing a source image comprising a plurality of pixels , { TAIL ~ each pixel } having a source value , providing an inverted threshold value for each pixel of the plurality of pixels , and generating thereof a temporary image comprising a temporary value for { HEAD ~ each pixel } of the plurality of pixels
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH