Each pixel of the supplied 8 bit greymap is replaced by a random value.
The resulting greymap is returned.
> (define g (greymap-create 1024 768)) g > (greymap-randomize! g) #<greymap orow:-1 ocol:-1 xres:-1 yres:-1 w:1024 h:768> > (greymap-writepng g "greymap-randomize.png") ok >
The resulting 8 bit greymap displays as follows: