PHP判斷一張圖片的主色調的代碼片段

這段代碼可以幫助你判斷任意圖片的主色調，使用了簡單的統計算法實現

$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); </pre>