(PECL imagick 2, PECL imagick 3)
Imagick::setImageCompression — Sets the image compression
public Imagick::setImageCompression ( int $compression ) : bool
compression
 One of the COMPRESSION constants 
 Returns true on success. 
Throws ImagickException on error.
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    https://www.php.net/manual/en/imagick.setimagecompression.php