Is there any way to write out an image without a color space attached?

I'm trying to write out png and jpeg files, without a color profile attached to them via CGImageDestinationCreateWithData + a CGImageRef of my making. I can't seem to figure out a way to do this though. Any pointers?

(And to the someone who is going to pipe up with how this is a _very bad idea_: thanks, I know. I have my reasons).

-gus