php如何判斷圖片顏色類型？實例教程

$i = imagecreatefromjpeg("image.jpg");
for ($x=0;$xfor ($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  ;
}
} // bbs.it-home.org
$rAverage = round($rTotal/$total);
$gAverage = round($gTotal/$total);
$bAverage = round($bTotal/$total);