Pimcore\Image\Adapter\ImageMagick::processOverlay PHP Method

    protected function processOverlay(ImageMagick $overlayImage, $composite = "COMPOSITE_DEFAULT", $x = 0, $y = 0, $overlayOpacity = 100)
    {
        //sets a value used by the compose option
        $allowedComposeOptions = ['hardlight', 'exclusion'];
        $composite = strtolower(substr(strrchr($composite, "_"), 1));
        $composeVal = in_array($composite, $allowedComposeOptions) ? $composite : 'dissolve';
        //save current state of the thumbnail to the tmp file
        $this->saveIfRequired('compose');
        $this->setForceAlpha(true);
        $this->addConvertOption('compose', $composeVal)->addConvertOption('geometry', "{$overlayImage->getWidth()}x{$overlayImage->getHeight()}+{$x}+{$y}")->addConvertOption('define', "compose:args={$overlayOpacity},100")->addConvertOption('composite')->addFilter('compose', $overlayImage->imagePath);
        $this->save($this->getOutputPath());
        return $this;
    }