How do i change background color to transparent

[Ather Ali Shaikh]

I have developed a pie chart successfully.
But the problem is the background color of the piechart.
When I am using Color.Transparent it black the color
and if I use Color.empty it is also black the background color.

What should I do to make transparent means "No Color" the color at
background is should be the page back color.

Regards
Ather

 

[Chris Jackson]

What ImageFormat are you using? Not all image formats support transparency.