Changing the alpha-channel of a plotted image doesn't work for me in an ipython (pylab) shell.
The example below illustrates the problem (i hope so at least ...)
Running it with %run - everything is fine and the two images look the same.
Runing it line by line without the show, the figure shows up, the images are plotted, but the alpha-value of im1 is not set correctly so it's fully opaque in the left plot.
Is it just me or is it a bug, and if it's a bug is it a bug in pylab or in matplotlib?
Thanks in advance!
import numpy as np
from matplotlib.pyplot import *
aimg = np.array([[0, 1, 1, 0],
[0, 1, 2, 0],
[0, 1, 3, 0],
[0, 1, 4, 0]])
ax = subplot(121)
im1 = imshow(aimg, alpha = 1, interpolation='nearest')
ax = subplot(122)
im2 = imshow(aimg, alpha = 0.5, interpolation='nearest')