changing the background

[johnson abraham <johnson.abraham@xxxxxxxxx>]

Hi,
I am taking the screen shot of the plot to be included in my report, 
Since the background is black.
some of the finer details in the plot are not visible, I think having 
the background in white would enable
the finer details in the plot to be visible.
How to change the background of the plot from black to white.

cheers,
Johnson Abraham