Jisho

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こうけいしょく 口径食
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Noun
1. vignetting​
Wikipedia definition
2. Vignetting​In photography and optics, vignetting  is a reduction of an image's brightness or saturation at the periphery compared to the image center. The word vignette, from the same root as vine, originally referred to a decorative border in a book. Later, the word came to be used for a photographic portrait which is clear in the center, and fades off at the edges. A similar effect occurs when filming projected images or movies off a projection screen.
Read “Vignetting” on English Wikipedia
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