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Vignetting is something you see a lot in photography, and it works just as well in architecture illustrations. The idea is simple, the edges of the illustration are darkened to “frame” the image and draw attention to the center. If there is a lot going on in the rendering, this is an easy way to draw the eye to your design in the center, and avoid distracting geometry around the perimeter.
照片暗角在摄影中使用很广泛，也同意适用于建筑图像表现。想法很简单，图像的边缘有意加暗以增加层次感，同时将视觉焦点转移到图面中心。如果你在渲染建筑上花了很多功夫，添加照片暗角会是一个让视觉聚焦在中心部分你的设计上的很简单的方法，同时能避免四周的东西分散人的注意力。
There are many ways to produce this effect. Many of them can be automated with software such as Photoshop (Filters>Distort>Lens Correction) and Lightroom. I prefer to paint in the shadows because I don't always want even shading around the perimeter. Here is how its done:
有很多方法可以实现这种效果。很多可以用像Photoshop(滤镜>扭曲>镜头校正）和Lightroom等软件实现。我更喜欢在四周画上暗角因为我不总需要四周均等分布的暗晕。以下是我的做法：
First, open the image in Photoshop. The image I will be using is below. For the most part, it looks finished. However, there were many buildings, to the sides and in the distance, were not modeled. Adding vignetting will draw attention to the center of the illustration and put the focus on my design instead of what I did not design.
首先，在Photoshop中打开图片。图片操作如下，大体来看，这张图是已经做好了。但是，主体建筑的旁边和远处有许多别的没有建模的建筑（地图上的截图）。添加照片暗角能把人的注意力吸引到中心部分，视觉聚焦于我的设计上，而不是在我没设计的部分。（译者注：cs6里的镜头校正点击滤镜即可看见，不在扭曲滤镜下，选择自定，调整晕影的数量）
Create a new layer and move that layer to the top of the layers pallet. 新建一个图层并把新图层移到所有图层最上端。
Select the "Paint Brush" tool, and with black paint, a soft brush, and an opacity below 20%, begin to paint the perimeter. In this case, I wanted to play up the horizon, so I focused most of the darkness in the corners, with less shading on the sides. 选择画笔工具，前景色调为纯黑，硬度调低，不透明度调到20%以下，开始在四周画。在这个案例中，我想强调地平线上部分，所以主要画在图面左下角和右下角，旁边部分少画一些。
Going to Filter>Distort>Lens Correction or using the gradient tool could also be used to achieve a similar effect, but like I said above, sometimes it's not desired to have an even gradient around the image. Most of the time, a subtle bit of shading is all that is needed. 选择镜头，扭曲，镜头校正或者渐变工具也可以用来实现类似的效果，但是正如我上面所说的，有时我并不想图面四周有均等的渐变。大多数时候，我需要的是一点微妙的晕影。
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拓都将军
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