Adding image with low opacity over existing image

Robust

Well-known member
Well, I guess you can guess what this is for.

Is there any way (in XF/Zend or general PHP) to add a 30% opacity image, let's say, over another image like a signature or avatar? I think this sort of image manipulation is possible in Imagick, not sure about GD and I have no idea on how to go about it either way.
 
Is it about the Paris attack add-on someone talked about on TAZ? If so you just use CSS to add that effect.
 
You know what makes it harder, the fact that XF has 3 different avatars in sizes in 3 different locations independently... I'd rather prefer an avatar.php solution.
 
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