using black-outlined cartoon illustrations in projection

I'm going to project my illustrations and am making them in gifs and also jpegs. i am the composer/artist presenting them to the projection-ist for our live music video/art shoot in a few weeks) the jpegs i am rendering with a solid black background and the gifs with empty backgrounds. if my cartoon-ish illustrations are shaped in black outlines, will the black outline disappear when the image is projected? i am wondering this because the projectionist told me to make the jpegs with black background... i got the impression that the projector won't project true black...so now I'm confused. How do I retain my images black outline in projection... and what format is best to save them? Hoping for your answers soon! THANKS!