I have included a pic to illustrate my question. The image size for render is 1929x1200. The areas marked by x's fall outside that area. When the scene is populated by figures and objects (especially when it is dark), it is very difficult to distinguish between the render and non-render areas. Is there a way to darken or eliminate these areas so as to better see the render area?

I think I see what you are talking about, Tarin421, and that will work in a pinch, thanks. 

 Thanks!