对比度阈值，小于该值的像素将不产生散景效果。
The contrast threshold below which pixels will not have bokeh artifacts applied.
如果您使用该值，将提升渲染性能，因为这样做可以避免生成一些不必要的散景效果。
Performance will be improved if you use this parameter to avoid generating unnecessary bokeh artifacts.
该值的重要意义在于你通常只想场景中一些高频率地方（即图片中的噪声区域）产生散景效果，否则他们将几乎无法看见。
The significance of this is that you usually only need bokeh shapes in areas of high frequency (ie, cluttered or "noisy" areas of image) since they are otherwise nearly invisible.
该值的重要意义在于你通常只想场景中一些高频率地方（即图片中的噪声区域）产生散景效果，否则他们将几乎无法看见。
The significance of this is that you usually only need bokeh shapes in areas of high frequency (ie, cluttered or "noisy" areas of image) since they are otherwise nearly invisible.
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