Help wanted clipping an image region and saving as new bitmap

Hi Thanks you for your reply. In the example below, if I create a clipped region around an image, what would I pass in as the rendered bitmap.

The same if I created an image and added a pathgeometry to only show part of the image how to I passing only the clipped part of the image.

// Sample 4

// Create the image to clip.

Image myImage = new Image();

Uri imageUri =

new Uri(@"C:\\Documents and Settings\\All Users\\Documents\My Pictures\\Sample Pictures\\Water lilies.jpg", UriKind.Relative);

myImage.Source = new BitmapImage(imageUri);

myImage.HorizontalAlignment = HorizontalAlignment.Left;

// Use an EllipseGeometry to define the clip region.

EllipseGeometry myEllipseGeometry2 = new EllipseGeometry();

myEllipseGeometry2.Center = new Point(100, 75);

// Create a render bitmap and push the surface to it
RenderTargetBitmap renderBitmap =
new RenderTargetBitmap(
(int)size.Width,
(int)size.Height,
96d,
96d,
PixelFormats.Pbgra32);
renderBitmap.Render(yourui);
// Encode the image in the format selected
System.Windows.Media.Imaging.BitmapEncoder encoder = default
System.Windows.Media.Imaging.BitmapEncoder);
// Create a file stream for saving image
using (FileStream outStream = new FileStream(fileName, FileMode.Create))
{
switch (fileExtension.ToLower())
{
case ".jpg":
case ".jpeg":
encoder = new System.Windows.Media.Imaging.JpegBitmapEncoder();
break;
case ".png":
encoder = new System.Windows.Media.Imaging.PngBitmapEncoder();
break;
case ".gif":
encoder = new System.Windows.Media.Imaging.GifBitmapEncoder();
break;
case ".bmp":
encoder = new System.Windows.Media.Imaging.BmpBitmapEncoder();
break;
case ".tif":
case ".tiff":
encoder = new System.Windows.Media.Imaging.TiffBitmapEncoder();
break;
}
// push the rendered bitmap to it
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
// save the data to the stream
encoder.Save(outStream);
}