my apologise for the previous mail in spanish

well, my question is how show a image in scale of gray from 0 to 1?, because, my prgram is :

from pylab import *
from scipy import *

H=array([[0.0,0.0,0.5,0.0,0.0],[0.0,0.0,0.0,0.0,0.0],[0.0,0.0,0.0,0.0,0.0],[0.0,0.0,0.0,0.0,0.0],[0.0,0.0,0.0,0.0,0.0]])

print H;
figure()
imshow(H,cmap=cm.gray)

well, 0.5 show how white and it's not correct, because the 0.5 is the half the scale the gray

thanks