Otherwise, vignetting may occur when zooming out.

否则，可能会出现渐晕放大了。

Vignetting refers to the lightening or darkening of the edges of an image.

虚光照是指增亮或是调暗图片的边缘。

Meanwhile a new method to compute the vignetting coefficients has been given.

文章同时给出了计算渐晕系数的新方法。

Custom presets are then applied that add contrast, vignetting, and sharpening.

然后将利用自定义的预设文件处理对比度、修饰和锐度等。

Vignetting and distortion are both corrected excellently for a lens of this speed.

渐晕和变形都纠正了这种速度镜头出色。