The right way to access red channel in Lena

[Adam Hughes]

I'm trying to build a filter to show only the red channel in the lena 
image.  I defined two masks:

(1,0,0)
(255,0,0)

Oddly, the (255,0,0) gives me the correct plot when doing imshow(), but 
(1,0,0) doesn't.  Why does the (1,0,0) mask lead to light regions being 
dark and dark regions being light?  Here's a working example:

%pylab inline
from skimage.data import lena

lena = lena()

f, (ax1, ax2) = plt.subplots(1,2, figsize=(8,6))

ax1.imshow(lena*(1,0,0))
ax2.imshow(lena*(255,0,0))


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