A coating or backing on photographic film that absorbs light to prevent it from bouncing back and creating a blurred or halo-like effect in photographs.
From anti- (against) + halation (from 'halo,' the glowing ring effect in photos). Developed in early photography to improve image quality by preventing unwanted light reflection.
Before digital cameras, photographers battled the halation effect—light bouncing around inside film—and antihalation coatings were the invisible hero that made crisp, clear photos possible.
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