double exposure tips anyone????

[Forest Power Ranger]

If you really want both images to stand out the background must be completely black for both. As for exposure, I've always just had the exposure equal for both images and never had a problem. Don't expose in the same area twice as well. You're get ghosting. Unless that's what you want... idk

You can see the problem with not having your background completely blacked out here. Tiny bit of ghosting.