Hello,
You can't use the URI to get the image a URI is just a string of characters used as an id for a resource.
What you need to do is get the XpsImage itself and get read the stream
XpsImage image = myXpsDocument.FixedDocumentSequenceReader.FixedDocuments[0].FixedPages[0].Images.First();
Bitmap myBitmap = new Bitmap(image.GetStream());
Valery.