What is Halation?

Pinyin gung yùn

Halo

(natural phenomenon)

Pinyin gung yùn

From

[halation] from

Halo with blurred edges.

Halation refers to the fact that when strong light is projected onto a film during exposure shooting, it is reflected through the film emulsion on the surface of the film base, causing the image to become halo. In order to prevent this phenomenon, a colored layer is sometimes applied between the film base and the emulsion layer, which can be removed during development, or coated on the film base with a gray color.