[Typo3-dev] Graphicsmagic and m.mask (3.8.0)

[Arco]

When using IM I can watermark an image by using :
	$image['file.']['m.'] = array(
		'bgImg' => $image['file'] ,
		'mask' => $this->conf['watermark_mask'] ,
		'bottomImg' => $this->conf['watermark_bottomimg'] ,
		'bottomImg_mask' => $this->conf['watermark_bottomimg_mask'] ,
	);

With GM (1.1.7) I see nothing happening.
Does anybody know if it´s possible with 3.8.0?

Arco