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views:

19

answers:

1
Q: 

How can I use Alpha Compositing (Porter and Duff) with C#?

Are there a implementation (API) of Alpha Compositing for .NET. The Wikipedia means that Windows has a native implementation of it. Of course it can be do with pixel manipulation but this will be a bad performance. If there are a native implementation then we should use it.

If there is no native implementation that can be used from .NET then there is a library that implement it already?

In Java there is a class AlphaComposite and is very simple.

+1  A: 

Windows GDI+ does provide some alpha blending. In .NET, it's exposed by the Graphics class, which is quite well documented. For alpha blending specifically, start with Alpha Blending Lines and Fills.

Jim Mischel  2010-09-10 15:04:58
Thanks for the answer but this is only one of the 12 blending algorithm from Porter and Duff and only if you use a brush. If you want draw an image which has no alpha and you want draw it with an alpha then it is difficult.
Horcrux7  2010-09-10 21:53:40

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