(PECL imagick 2, PECL imagick 3)
Imagick::setImageOpacity — Sets the image opacity level
此函數在 Imagick 3.4.4 中被 廢棄，強烈建議不要應用此函數。
$opacity): boolSets the image to the specified opacity level. 此方法在Imagick基于ImageMagick 6.3.1以上版本編譯時(shí)可用。 This method operates on all channels, which means that for example opacity value of 0.5 will set all transparent areas to partially opaque. To add transparency to areas that are not already transparent use Imagick::evaluateImage()
opacityThe level of transparency: 1.0 is fully opaque and 0.0 is fully transparent.
成功時(shí)返回 true。
示例 #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;
?>