PHP判断一张图片的主色调的代码片段

这段代码可以帮助你判断任意图片的主色调，使用了简单的统计算法实现

$i = imagecreatefromjpeg("image.jpg");  
  
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 >>  & 0xFF;  
        $b   = $rgb & 0xFF;  
  
        $rTotal += $r;  
        $gTotal += $g;  
        $bTotal += $b;  
        $total++;  
    }  
}  
  
$rAverage = round($rTotal/$total);  
$gAverage = round($gTotal/$total);  
$bAverage = round($bTotal/$total);