(PECL imagick 2.0.0)
Imagick::setImageOpacity — Sets the image opacity level
Sets the image to the specified opacity level. This method is available if Imagick has been compiled against ImageMagick version 6.3.1 or newer.
The level of transparency: 1.0 is fully opaque and 0.0 is fully transparent.
Returns TRUE on success.
Example #1 A Imagick::setImageOpacity() example
An example of using Imagick::setImageOpacity()
<?php
/* Create the object */
$image = new Imagick('source.png');
/* Set the opacity */
$image->setImageOpacity(0.7);
/* output the image */
header('Content-type: image/png');
echo $image;
?>