Regression in imshow #7373
Description
The imshow command in 2.0.0b4 and current master (07adcde) don't export images with colormaps correctly. The colormap is not scaled correctly:
This bug is not present in 1.5.1:
Some precisions:
- version 1.5.1 from ubuntu 16.04 repository
- git master (07adcde) #installed from source on ubuntu 16.04
Code to reproduce this behavior:
#!/usr/bin/env python2.7
import matplotlib
import matplotlib.pyplot as plt
import numpy as np
print(matplotlib.__version__)
cmap = plt.cm.jet
# coordinates
bbox=20
resolution = 100
xcoords = np.linspace(0, bbox, resolution)
ycoords = np.linspace(-bbox, bbox, 2*resolution)
# evaluate
xnb = len(xcoords)
ynb = len(ycoords)
dat = np.zeros((ynb,xnb))
for i in range(xnb):
for j in range(ynb):
dat[j][i] = np.sqrt(xcoords[i]**2+ycoords[j]**2)
# export to png
plt.imsave("imshow.png", dat, cmap=cmap, vmin=0, vmax=None)