P3
# example from the man page
4 4
255
  0  0   0    0   0   0    0   0   0  255  0 255
  0  0   0    0 255 119    0   0   0    0  0   0
  0  0   0    0   0   0    0 255 119    0  0   0
255  0 255    0   0   0    0   0   0    0  0   0