色抽出 - 平均色

SenseOfColor.php

<?php

class SenseOfColor
{
    private $filepath;

    public function __construct($filepath)
    {
        $this->filepath = $filepath;
    }

    public function getColor()
    {
        $img  = imagecreatefrompng($this->filepath);
        $imgX = imagesx($img);
        $imgY = imagesy($img);
        $imgXY = $imgX*$imgY;

        $rSum = '';
        $gSum = '';
        $bSum = '';

        for ($y = 0; $y < $imgY; $y++) {
            for ($x = 0; $x < $imgX; $x++) {
                $rgb = imagecolorat($img, $x, $y);

                $r = ($rgb >> 16) & 0xFF;
                $g = ($rgb >> 8) & 0xFF;
                $b = $rgb & 0xFF;

                $rSum += $r;
                $gSum += $g;
                $bSum += $b;
            }
        }

        return '#'.dechex($rSum/$imgXY).dechex($gSum/$imgXY).dechex($bSum/$imgXY);
    }

}
class SenseOfColorFactory
{
    public static function create($filepath)
    {
        return new SenseOfColor($filepath);
    }
}

$imgColor = SenseOfColorFactory::create('img/orange_white.png');
print($imgColor->getColor());