Overlay 2 images in QLabel

painting 2 images in 1 Label, though
I want the program to allow the user to to check for Similarities,

Method:
I paint the primary image in label,
then i want to print a semi-transparent image over the primary image...

Hence I want to load a secondary image over a primary image.
the secondary image must be somehow transparent,
so both images can be seen. & then similarities can be seen

Can Qt label support it?
How would I go about this -> Ideas please
Links to similar functionality

Kind Regards :)