Halation (English spelling)

Japanese: ハレーション(英語表記)halation
Halation (English spelling)
When very strong light hits a photographic plate or film, the light that passes through the photosensitive layer is reflected back by the back side of the film base, resulting in fogging. This often occurs when taking a photograph against strong backlight or a bright light source. To prevent this, methods are used to coat the film base with a dye (antihalation layer) or to lightly color the film base itself (gray base) to weaken the reflected light.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
写真乾板やフィルムに非常に強い光が当るとき,感光層を通り抜けた光がフィルムベースの裏側で反射されて戻ることによって起るかぶりをいう。強い逆光線や明るい光源に向けて写真を撮るときによく起る。これを防ぐために,フィルムベースに染料を塗布したり (ハレーション防止層) ,フィルムベース自体を薄く着色させて (グレーベース) 反射光を弱くしたりする方法が採用されている。

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