Matplotlib Colors

colormap.py

import numpy as np
import matplotlib
import matplotlib.pyplot as plt

cmap = matplotlib.cm.get_cmap('magma')
f,axarr = plt.subplots(1,3)

x   = np.arange(0,1,0.01)
img = np.zeros((len(x),len(x),4))
for x_id, x_ in enumerate(x):img[x_id,:,:] = np.repeat(np.expand_dims(np.array(cmap(x_)), axis=0), len(x), axis=0)
axarr[0].imshow(img, cmap='magma')

x   = np.arange(-1,2,0.01)
img = np.zeros((len(x),len(x),4))
for x_id, x_ in enumerate(x):img[x_id,:,:] = np.repeat(np.expand_dims(np.array(cmap(x_)), axis=0), len(x), axis=0)
axarr[1].imshow(img, cmap='magma')

x   = np.arange(-1,255,0.1)
img = np.zeros((len(x),len(x),4))
for x_id, x_ in enumerate(x):img[x_id,:,:] = np.repeat(np.expand_dims(np.array(cmap(x_)), axis=0), len(x), axis=0)
axarr[2].imshow(img, cmap='magma')

plt.show()