A STUDY ON
Halation refers to a phenomenon observed in celluloid film where intense light scatters within the film, leading to a secondary exposure. This effect predominantly impacts the red layer of the film, with some influence on the green layer, resulting in a characteristic reddish-orange glow around the light source. The precise tint of the halation can vary depending on white balance adjustments and color grading processes applied during post-production.
The anti-halation layer is typically applied to the rear of the film base, although it can also be found between the light-sensitive emulsion and the base itself. Its primary function is to inhibit light reflection from the back surface of the base or any objects located behind the film. This serves to counteract the halo-like effect known as halation. However, it’s worth noting that even with the presence of this layer, a faint halo effect might still occur since the anti-halation layer isn’t entirely opaque.