Do you mean a splash image that appears on the desktop?
how I did it was (in simplified meta code)
1) copy the desktopbuffer to a spare gfx buffer
2) display the splash image (standard image)
3) copy the spare gfx buffer to the desktopbuffer
how I did it was (in simplified meta code)
1) copy the desktopbuffer to a spare gfx buffer
2) display the splash image (standard image)
3) copy the spare gfx buffer to the desktopbuffer