Hey all,

When I do the Sketch style render, the image is always black on a white background (unless I pick a different style, obviously).  Is it possible to change that white background to transparent?

Thanks!

Not that I know of.
What you could do is render it (black on white, white on black, whatever)
Then bring it into PS or PSP as a layer over something else.

Then use the "Screen" function. This will make the black parts transparent and leave the white parts visable.