Can't get a white background

[TomA]

In the environment rollout I have set the background colour to pure white, but in my rendered images the background becomes grey - this hasn't happened to me before.

 

How do I get it to be pure white again?

[cg_Butler]

It sounds like your camera is exposing the background. In the colour mapping rollout, untick affect background and that should fix it. I hope!

[Corey Beaulieu]

I think Andy is right, but why would you render a white background? Just render it black and replace it in PS.

 

I've never rendered a white background, but I feel like that will just give you a strange halo around your object- assuming you swap the background later.

[bilderbaurendering]

Hi there, i agree with Corey. I would use some HDRI for reflections and than substitue in PS. Anyhow it would be helpful if you send us the image.