You say a neutral background color. What do you mean by neutral? I always render on black. If you check "Background: Black" in render options and save as a tiff or psd file, you'll get an alpha channel for the figure outline. In Photoshop you can make your render a floating layer, select the alpha channel and delete the black background. That leaves no outline. Additional you can then invert the selection, turn it into a 2 pix frame and apply a slight (about 1.8) gaussian blur. That will smooth the outline of the figure to merge it better to the new background.