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.