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我想在图片上设置透明度,当imagick的版本为6.8.9时,下面的图片不起作用。imagick图像水印透明
<?php
// Open the original image
$image = new Imagick();
$image->readImage(3.jpg);
// Open the watermark
$watermark = new Imagick();
$watermark->readImage(2.png);
$watermark->setImageOpacity(0.4);
// Overlay the watermark on the original image
$image->compositeImage($watermark, imagick::COMPOSITE_OVER, 20, 20);
// send the result to the browser
header("Content-Type: image/" . $image->getImageFormat());
echo $image;
有没有解决透明问题的另一种方法?