Converting WriteableBitmap to a Bitmap for saving to an image file

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C#

ASP.NET

Silverlight

C#4.0

Hi Hackers,

SO i have been dabbling a little bit with System.Windows.Media.Imaging namespace and I am experimenting with accessing web cam through a silverlight web app. I can get the webcam's live feed and even capture a frame to a Rectangle, but I am finding myself at a dead end not being able to save that frame to an image file (.png or .jpg).

The frame captured is basically a WriteableBitmap and the below shown code converts the pixel array of the WriteableBitmap to bytes and pumps them out to a file.

BinaryWriter bw = new BinaryWriter(new FileStream(path, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.ReadWrite));
for (int i = 0; i < a_pixels.Length; i++)
{
      bw.Write((byte)a_pixels[i]);
}

bw.Flush();
bw.Close();

Turns out it does create a file but obviously not in the correct format which means something more has to be done to render it into an image format. Which is what my question is "what do you think I may be missing?". Please don't forward me to open source libraries or anything like that coz I want to be able to do this myself which is why I haven't already opted for third party libs.

Help much appreciated. Thanks. Please let me know if you need more info.

Cheers.