AutoCad 3D :: White Background Render (Scene)

I am trying to render a scene, but without having a grey background. I have tried the following techniques

1. Tried adding a sun and sky illumination, its renders the image perfectly but this sadly brings in a greyish background.
2. Tried creating a view in model space and then I added a white background image, but it seems to darken the render, although it does sort the white background problem
3. Finally I tried creating a viewport in paperspace, this sorts the white background problem, but I then lose all of my shadows.

All of the above are based on a perspective view/angle