Hi, When I attempt to plot small-scale features with the PS backend, it seems that there's a granularity at which things cannot be further specified. I cannot remember encoutering this before, although I can't be sure it's not an old phenomenon. Anyhow, the following script illustrates the issue. With the PS backend, zooming in on the output shows the points spread significantly away from their locations that would be expected.
import matplotlib
matplotlib.use('PS')
import pylab
import numpy
x=numpy.linspace(-100,100,2000)
x+=0.001*numpy.random.rand(len(x))
y=numpy.sin(x/30.0)
y+=0.001*numpy.random.rand(len(x))
pylab.plot(x,y,'.',ms=0.1)
pylab.savefig('dots_dynamic_range')
With the Agg and PDF backends, this does not occur. I'm attaching a few
example images which hopefully make the issue clear. (These have all
seen a little bit of processing to reduce the file sizes.)
<<inline: backend_Agg.png>>
<<inline: backend_PDF.png>>
<<inline: backend_PS.png>>
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