Print picture on plain paper. Coat piece of wood with mod podge. Turn picture upside down on wood, press and let dry overnight. Next day using water and your hands rub paper off wood. Your picture has transferred onto the wood. Cover with more mod podge.
Transfer a Photo onto a Slab of Wood: cover wood with gel medium; place paper picture-side down; firmly smooth out all bubbles; let dry overnight; gently rub wetted paper off; clean all paper residue off; cover with mod podge; let dry;