bmp.zi: grimage.zi 
grimage.zi: pixmap.zi 
ppm.zi: pixmap.zi grimage.zi 
bmp.zo: bmp.zi grimage.zi 
color.zo: color.zi 
grimage.zo: grimage.zi bmp.zi color.zi ppm.zi 
pixmap.zo: pixmap.zi color.zi 
ppm.zo: ppm.zi grimage.zi 
