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  1. or download this
    $diff = abs($r1 - $r2) + abs($g1 - $g2) + abs($b1 - $b2);
  2. or download this
    $diff = ($r1 - $r2) ** 2 + ($g1 - $g2) ** 2 + ($b1 - $b2) ** 2;
(or I can make this more std like)
  3. or download this
    my $ll = 0.212671 * $r + 0.715160 * $g + 0.072169 * $b;