Re: [Matplotlib-users] colormap shift

[klo uo <kl...@gm...>]

I asked same question with different problem here:
http://matplotlib.1069221.n5.nabble.com/How-to-shift-colormap-td18451.html

You can see there how to use Gimp and create mpl colormap and then later
there is nifty code that will allow you to shift colormaps with a slider

>From your problem I assume you would want the first.

Here is ready made for you:

========================================
import matplotlib as mpl
import matplotlib.pyplot as plt

ccm = {
'red' : (
(0.000000, 0.000000, 0.000000),
(0.000001, 1.000000, 1.000000),
(0.500000, 0.500000, 0.500000),
(1.000000, 0.000000, 0.000000)
),
'green' : (
(0.000000, 0.000000, 0.000000),
(0.000001, 1.000000, 1.000000),
(0.500000, 0.500000, 0.500000),
(1.000000, 0.000000, 0.000000)
),
'blue' : (
(0.000000, 0.000000, 0.000000),
(0.000001, 1.000000, 1.000000),
(0.500000, 0.500000, 0.500000),
(1.000000, 0.000000, 0.000000)
)
}

cm = mpl.colors.LinearSegmentedColormap('my_map', ccm)

from numpy import outer, arange, ones
a = outer(arange(0, 1, 0.01), ones(10))

plt.imshow(a, cmap=cm)
plt.show()
========================================