php 提取图片主要颜色

PHP实现获取图片颜色值的方法

PHP获取图片颜色值检测图片主要颜色是通过imagecreatefromjpeg函数读取图片，再循环获得各个颜色值加以计算实现的。

 /**
  * 获取图片主要颜色
  * @param $image
  * @return array
  */
 function dominant_color($image)
 {
     $rTotal = $gTotal = $bTotal = $total = 0;
     $i      = imagecreatefromjpeg($image);
     for ($x = 0; $x < imagesx($i); $x++) {
         for ($y = 0; $y < imagesy($i); $y++) {
             $rgb    = imagecolorat($i, $x, $y);
             $r      = ($rgb >> 16) & 0xFF;
             $g      = ($rgb >> 8) & 0xFF;
             $b      = $rgb & 0xFF;
             $rTotal += $r;
             $gTotal += $g;
             $bTotal += $b;
             $total++;
         }
     }
     $rAverage = round($rTotal / $total);
     $gAverage = round($gTotal / $total);
     $bAverage = round($bTotal / $total);
     return array(
         'r' => $rAverage,
         'g' => $gAverage,
         'b' => $bAverage,
     );
 }