The sabattier effect is
a.
a picture that includes the full face or another feature with much detail.
b.
a darkroom technique to create surreal images, which is made by re-exposing a partially developed print to light during the processing.
c.
a printing process in which an image is photographed through a screen on to a sensitized printing plate that after development is etched.
d.
a process of combining several distinct images to produce a blended or combined picture. this is done by blocking out certain parts during processing, while in the dark room.