PHPで画像のメインカラーを抽出

$i = imagecreatefromjpeg("image.jpg");

for ($x=0;$x for ($y=0;$y $rgb = imagecolorat($i,$x,$y);
 $r = ($rgb >> 16) & 0xFF;
 $g = ($rgb > > & 0xFF;
 $b = $rgb & 0xFF;

 $rTotal += $r;
 $gTotal += $g;
 $bTotal += $b;
 $total++;
 }
}

$ rAverage =round($rTotal/$total);
$gAverage =round($gTotal/$total);
$bAverage =round($bTotal/$total);

php