在摄影和光学领域内，晕影或暗角是指图像的外围部分的亮度或饱和度比中心区域低。晕影的出现通常是因为相机的设置和镜头的限制因素等，被认为是不希望得到的和非故意的效果，然而，有时却因为需要创意风格而被刻意加入，例如引起对图像中心区的注意。摄影师也会故意选择能产生晕影的镜头来制造特效，也可以使用特别的滤镜或以后期处理来制造晕影。

晕影的英文“vignetting”源自法语“vignette”，最初是指书本的装饰边，后来则用于描述中间清晰而逐渐消失在边缘的照片。在投影屏上投影出来的照片或者影片也有相类似的效果。

In photography and optics, vignetting (/vɪnˈjɛtɪŋ/; French: "vignette") 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, resulting in a so-called "hotspot" effect.