[Unity 组件参考手册]组件：图像特效脚本之渐晕效应

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The Vignetting image effect introduces darkening, blur and chromatic aberration (spectral color separation) at the edges and corners of the image. This is usually used to simulate a view through a camera lens but can also be used to create special effects.渐晕图像特效变在图像的边缘和拐角区域进行变暗、模糊和色差 (光谱颜色分离)操作。这通常用于模拟通过摄像机镜头的显示视图，但也可用于创建一些特殊的效果。
Example of Vignetting. Notice how the screen corners get darker and more blurred and also show color separation.
渐晕特效例子。注意屏幕的边角区域是如何变暗、模糊和颜色分离的。As with the other image effects, this effect is only available in Unity Pro and you must have the Pro Standard Assets installed before it becomes available.和其他图像特效一样，该特效只能在Unity Pro上进行使用，并且在使用之前必须安装Pro Standard Assets。
Properties 属性    Intensity 亮度
    The degree of darkening applied to the screen edges and corners.
    应用于屏幕边角区域的调暗强度。
    Chromatic Aberration 色差
    The degree of chromatic aberration. A value of 0.0 will disable chromatic aberration entirely.
    色差程度。0.0表示完全关闭色差功能。
    Blur 模糊
    The amount of blur that is added to the screen corners.
    在屏幕拐角区域添加的模糊程度。
    Blur Spread 模糊扩散
    The blur width used when Blur is added.
    当模糊添加时所用模糊宽度。 Hardware support 硬件支持This effect requires a graphics card with pixel shaders (2.0) or OpenGL ES 2.0. PC: NVIDIA cards since 2003 (GeForce FX), AMD cards since 2004 (Radeon 9500), Intel cards since 2005 (GMA 900); Mobile: OpenGL ES 2.0; Consoles: Xbox 360, ps3.这个特效需要显卡拥有像素着色器（2.0）或者OpenGL ES 2.0。台式机：2003年以后的NVIDIA显卡（GeForce FX），2004年以后的AMD显卡（Radeon 9500），2005年以后的Intel卡（GMA 900）；移动设备：OpenGL ES 2.0；控制台： Xbox 360、 PS3。All image effects automatically disable themselves when they can not&nbsp***n on end-users graphics card.所有图像特效如果无法在用户显卡上运行时将会自动被关闭。【来源：互联网】
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