本文介绍如何使用C#与GDI+创建一种特殊的图像处理滤镜——置换滤镜，包括旋涡效果等。通过改变像素的位置而非颜色来实现视觉上的变换效果。
http://www.codeproject.com/cs/media/displacementfilters.asp
Image Processing for Dummies with C# and GDI+ Part 5 - Displacement filters, including swirl
By Christian Graus
In the fifth installment, we build a framework for generating filters that work by changing a pixel's location, rather than colour.
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