Mathematically:
rr(i, j) = SUM(rs(0, j), ... , rs(i - 1, j), rs(i, j))
gr(i, j) = SUM(gs(0, j), ... , gs(i - 1, j), gs(i, j))
br(i, j) = SUM(bs(0, j), ... , bs(i - 1, j), bs(i, j))
0 <= rr(i, j) <= 255
0 <= gr(i, j) <= 255
0 <= br(i, j) <= 255
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Before operation | After operation |