gistfile1.txt

import numpy as np
import pylab
img = np.empty((480,640,3),'u1')

# Draw horizontal stripes yellow                                                                                                                                                    
img[(120,240,360),:,:] = (255,255,0)

# Draw vertical stripes purple                                                                                                                                                      
img[:,(160,320,480),:] = (255,0,255)
pylab.imshow(img)
pylab.waitforbuttonpress()