Invert pcb layout

What pcb software can invert pcb layout for negative film?

That is a common problem, at least with Eagle. The solution is to print to a file as black and white, then invert color with a something like Photoshop. I recall that very old versions of Eagle allowed printing a negative, but I don't have any of those versions (pre-6.0) on my machine, and you can't open anything made with a later version with those old versions.

EDIT:
After a little playing, you can get a .png export as the negative. Just select "export" and "monochrome" Of course then, you still need to be sure the scaling is OK with your printer.

In Eagle under the CAM job, you can select PS-INVERTED for the output format for the layers you want to invert. (typically top and bottom only)