I am using the camera tool to create a background for a chart so that when
the results reach a certain level the surrounding background changes to
green, or red if poor results etc The problem i have may seem cosmetic but
the picture (camera object) has sharpe corners where rounded would be more
desirable for the charts appearence. how can i achieve this? any help would
be apreciated.

I have seen similar charts on Charley Kyds website but there are no
instructions on how its done!