How to make and use a DAB colormap.

dab_colormap.py

#! /bin/usr/env python
# -*- coding: utf-8 -*-

"""Building DAB colormap."""

__author__ = "Xavier Moles Lopez <x.moleslo@gmail.com>"
__date__ = "01/05/11"

from pylab import *
from matplotlib.colors import LinearSegmentedColormap

# Definition des segments pour la couleurs DAB:
# Plus intense => plus foncé.

dab_dict = {'blue': [(0.0, 1.0, 1.0),
                    (0.20, 0.7647, 0.7647),
                    (0.40, 0.4902, 0.4902),
                    (0.60, 0.1765, 0.1765),
                    (0.80, 0.0392, 0.0392),
                    (1.00, 0.0, 0.0),
                    ],
           'green':[(0.0, 1.0, 1.0),
                    (0.20, 0.9098, 0.9098),
                    (0.40, 0.7608, 0.7608),
                    (0.60, 0.5059, 0.5059),
                    (0.80, 0.3176, 0.3176),
                    (1.00, 0.0, 0.0),],
           'red':  [(0.0, 1.0, 1.0),
                    (0.20, 1.0, 1.0),
                    (0.40, 0.8745, 0.8745),
                    (0.60, 0.7490, 0.7490),
                    (0.80, 0.5490, 0.5490),
                    (1.00, 0.3294, 0.3294),]}

# Création de la colormap
dab = LinearSegmentedColormap('my_colormap',dab_dict,256)


A = rand(10,10)

# Utilisation de la colormap dab.
pcolor(A,cmap=dab)
colorbar()

# Comparaison avec colormap jet.
figure()
pcolor(A,cmap=cm.jet)
colorbar()

show()