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Color filter

A color filter is a transparent, colored material—usually glass or gelatin—that is placed in front of a camera lens. Its purpose is to modify the light that strikes the image sensor or film. The filter transmits light of its own color and, conversely, reduces or completely blocks light of the complementary color—that is, the color opposite it on the color spectrum. In black-and-white photography, for example, a red filter is used to dramatically darken a blue sky, thereby making white clouds stand out. In color photography, filters are used to tint the image to a specific hue for creative purposes, such as creating a warmer tone with an orange filter, or for color correction directly during shooting.

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