How to save image using JpegBitmapEncoder

Question

According to the image encoding example here I should be able to use JpegBitmapEncoder to encode an image for saving as a jpeg file but get this compile error:

error CS1503: Argument 1: cannot convert from 'System.Windows.Controls.Image' to 'System.Uri'

I don't see a way (property or method in Image) to get System.Uri from Image. What am I missing?

The Image xaml code is

<Image Name="ColorImage"/>

The SaveImage C# is

...
SaveImage(ColorImage, path);
...
private void SaveImage(Image image, string path)
{
    var jpegEncoder = new JpegBitmapEncoder();
    jpegEncoder.Frames.Add(BitmapFrame.Create(image));
    using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write))
    {
        jpegEncoder.Save(fs);
    }
}

The code below (taken mostly from the kinect-sdk) streams 640 x 480 RBG to a WriteableBitmap at 30 Fps (the kinect ColorImageFormat is RgbResolution640x480Fps30).

using (var colorImageFrame = allFramesReadyEventArgs.OpenColorImageFrame())
{
    if (colorImageFrame == null) return;
    var haveNewFormat = currentColorImageFormat != colorImageFrame.Format;
    if (haveNewFormat)
    {
        currentColorImageFormat = colorImageFrame.Format;
        colorImageData = new byte[colorImageFrame.PixelDataLength];
        colorImageWritableBitmap = new WriteableBitmap(
            colorImageFrame.Width, 
            colorImageFrame.Height, 96, 96, PixelFormats.Bgr32, null);
        ColorImage.Source = colorImageWritableBitmap;
    }
    // Make a copy of the color frame for displaying.
    colorImageFrame.CopyPixelDataTo(colorImageData);
    colorImageWritableBitmap.WritePixels(
        new Int32Rect(0, 0, colorImageFrame.Width, colorImageFrame.Height),
        colorImageData,
        colorImageFrame.Width*Bgr32BytesPerPixel,
        0);
}

Answer 1

private void SaveImage(string path)
{
    var jpegEncoder = new JpegBitmapEncoder();
    jpegEncoder.Frames.Add(BitmapFrame.Create(colorImageWritableBitmap));
    using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write))
    {
        jpegEncoder.Save(fs);
    }
}