Hi,

I am setting a colourbar where I explictly set the tick intervals. However I

would like to exclude the colour black from this colourbar. The reason for

this is I would like to overplot some contour lines in black, so would like

to make them stand out.

An example...where I would like to exclude black as the bottom colour of the

colourbar, i.e. use the next level of gray.

import numpy as np

from mpl_toolkits.basemap import Basemap

import matplotlib.pyplot as plt

import matplotlib.colors as colors

import matplotlib as mpl

data = np.random.randint(0,50,100*100).reshape(100, 100)

m = Basemap(llcrnrlon=1.5, llcrnrlat=10.5, urcrnrlon=3.5, urcrnrlat=13.5,

resolution='c', projection='cyl')

fig = plt.figure(figsize=(8, 6))

ax = fig.add_axes([0.1, 0.1, 0.6, 0.7])

m.ax = ax

colourmap = plt.cm.Greys_r

ticks = [0, 10, 20, 30, 40, 50]

norm = colors.BoundaryNorm(ticks, colourmap.N)

im = m.imshow(data, colourmap, norm=norm, interpolation='nearest')

pos = ax.get_position()

l, b, w, h = pos.bounds

cax = plt.axes([l+w+0.045, b, 0.05, h])

cbar = mpl.colorbar.ColorbarBase(cax, cmap=colourmap, norm=norm,

ticks=ticks)

plt.show()

Many thanks,

Martin

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