Chroma Keying an image in Silverlight 3.0

03-25-2009 4:07 PM |

I have an Image created using the WriteableBitmap Render method.

Now, I have to make a specific color on that image to be transparent.

Does anybody have a sample of how can I do this with the ShadeEffect class or otherwise?

Thank you!

Re: Chroma Keying an image in Silverlight 3.0

03-25-2009 7:12 PM |

Why not just create the image with transparency in the first place? You have 8 bits of alpha channel to play with.

Re: Chroma Keying an image in Silverlight 3.0

03-25-2009 7:20 PM |

The Image is created from an arbitrary UIElement in real time, using the exact same colors as in the UIElement.  Once the image is created, I need to do a second pass and change all pixels of a given color to be transparent.

Any ideas of how to do that?