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.
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()
Parameters
opacity
The level of transparency: 1.0 is fully opaque and 0.0 is fully
transparent.
Return Values
Returns TRUE on success.
Examples
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;