The method further comprises: generating the first output image comprising a first output value for each pixel of {HEAD ~ the plurality} of pixels, {TAIL ~ the first output value} being generated from the temporary value and the source value for each pixel, and generating the second output image comprising a second output value for each pixel of the plurality of pixels, the second output value being generated from the temporary value 
The method further comprises : generating the first output image comprising a first output value for each pixel of { HEAD ~ the plurality } of pixels , { TAIL ~ the first output value } being generated from the temporary value and the source value for each pixel , and generating the second output image comprising a second output value for each pixel of the plurality of pixels , the second output value being generated from the temporary value
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