Hi all,
I've come across an apparent bug in imshow when outputting to PDF and
EPS files. (I haven't tested other vector formats.) It manifests as
a small scaling error between the raster image and the axes coordinates.
I have attached a test script to illustrate the problem. The
(correct) PNG output file shows a green 'X' at the common point
between four pixels near the center of the raster image. The extent
is chosen such that the coordinates refer to pixel centers. The PDF
and EPS output files show a misalignment between the X and the pixel
boundaries -- zoom in to see it clearly. Also, the topmost row and
rightmost column appear truncated.
I am using svn r7395.
Thanks for the attention,
Mike
import numpy as n
import matplotlib as mpl
import pylab
ny, nx = 50, 50
im = n.arange(ny*nx) % 3
im.shape = (ny, nx)
extent = (-0.5, nx-0.5, -0.5, ny-0.5)
fig = pylab.figure(0, figsize=(5,5))
fig.clear()
fig.hold(True)
ax = fig.add_subplot(111)
ax.imshow(im, extent=extent,
interpolation='nearest',
cmap=mpl.cm.gray,
origin='lower')
ax.set_autoscale_on(False)
ax.plot(((nx-1)/2.,), ((ny-1)/2.,), 'x', c='g', ms=4, mew=1.25)
pylab.draw()
#pylab.show()
dpi = 300
pylab.savefig('test.png', dpi=dpi)
pylab.savefig('test.pdf', dpi=dpi)
pylab.savefig('test.eps', dpi=dpi)
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