/**
* Merges the image specified as the argument into the main picture.
*
* @param ImageMagick $backgroundImage
* @return ImageMagick
*/
public function mergeImage(ImageMagick $backgroundImage)
{
$this->setTmpPaths($this, 'merge');
$this->save($this->getOutputPath());
//save the current state of the file (with a background)
$this->compositeCommandOptions = [];
$this->addCompositeOption('gravity', 'center ' . $this->getOutputPath() . ' ' . $backgroundImage->getOutputPath() . ' ' . $this->getOutputPath());
$this->processCommand($this->getCompositeCommand());
$this->imagePath = $this->getOutputPath();
$this->tmpFiles[] = $this->getOutputPath();
return $this;
}
