Quick way of displaying images
 

I need a quick way of displaying a pre-prepared image from a command. Something like dd if=file_in_framebuffer_format of=/dev/fb0. I seem to get random noise when I do dd if=/dev/urandom of=/dev/fb0 count=1000.

This is for an "ok to shutdown" screen, as I'm trying to make a system which is easy to use, and i think the normal "Power Down" message appearing at the bottom of the screen would be missed.

Would dumping straight to the framebuffer be the best way to go about this? Is there any information out there about the format needed for output to fb0?