虚光照是指增亮或是调暗图片的边缘。
Vignetting refers to the lightening or darkening of the edges of an image.
虚光照可以通过虚光罩创造出来，或是在暗室里通过烘烤或挡光图片的边缘。
Vignetting is created either in camera using vignetting hoods or in darkroom by burning or dodging the edges of the image.
和平行光照射遮光物体产生的实边缘相比，全反射现象中半明半暗视场的分界线处的虚边缘情况更为复杂。
Compared with the real edge generated when parallel beam illuminates an object, the virtual edge between bright and dark areas in the phenomenon of total reflection is more complex.
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