PHP把PNG图片转化为JPG时透明背景变黑色
$type = exif_imagetype($srcimg);switch($type) {
case 1:
$simg = imagecreatefromgif($srcimg);
break;
case 3:
$tmp = imagecreatefrompng($srcimg);
$w = imagesx($tmp);
$y = imagesy($tmp);
$simg = imagecreatetruecolor($w, $y);
$bg =imagecolorallocate($simg, 255, 255, 255);
imagefill($simg, 0, 0, $bg);
imagecopyresized($simg, $tmp, 0, 0, 0, 0,$w, $y, $w, $y);
break;
}
通过imagecolorallocate来设置你要的背景颜色
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