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