Contao-Bildgrößen in Templates

Contao-Bildgrößen in einem Rocksolid-Custom-Elements-Template verwenden:

<?php if ($imageObj = $this->getImageObject($slideImage->image) ): 
$imageResp = \Picture::create($imageObj->src, 3)->getTemplateData();
$this->insert('picture_heroslider', $imageResp);
endif ?>