substitute for imsubtract

[Pratap Vardhan]

if

a = np.array([ [255,10,75], [44, 225, 100]], dtype=np.uint8)
b = np.array([ [50, 50, 50],[50, 50, 50] ], dtype=np.uint8)

can (a.astype(int) - b.astype(int)).clip(0, 255) be good substitute for 
imsubtract function? If so or not so, is there a need to have this kind of 
function in skimage library?
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