noun
vignetting
In photography and optics, the darkening of image corners relative to the center, caused by lens design or obstruction.
このレンズは開放付近で口径食が目立つ。
This lens shows noticeable vignetting near wide open.
口径食を補正するために、ソフトウェア
To correct the vignetting, I increased the peripheral illumination in software.