Re: [Matplotlib-users] Default dpi for savefig

[John H. <jdh...@ac...>]

>>>>> "Yannick" == Yannick Copin <y....@ip...> writes:

    Yannick> Hi,
    >>>>>>> >>>>> "David" == David Huard <dav...@gm...>
    >>>>>>> writes:
    >>
    David> Hi, I'm a little bit lost with respect to setting the
    David> resolution of images saved in png.  The matplotlibrc file
    David> sets the dpi to 80, but the default keyword argument of
    David> savefig is set to 150. Thus, changing the rc setting to
    David> dpi=300 does not modify savefig's default behaviour.  Is
    David> there a way to set a default dpi that would be used when
    David> calling savefig ?
    >> 
    >> 
    >> Have you tried modifying the rc setting
    >> 
    >> savefig.dpi : 100 # figure dots per inch

    Yannick> On a related issue: when exporting a figure from the
    Yannick> tkagg backend (using the appropriate button) to PNG, the
    Yannick> dpi is arbitrirarily set to 300 (see backend_tkagg.py in
    Yannick> NavigationToolbar2TkAgg.save_figure):

    Yannick> self.canvas.print_figure(fname, dpi=300)

    Yannick> I think it should honor the savefig.dpi rc setting:

    Yannick> self.canvas.print_figure(fname,
    Yannick> dpi=rcParams['savefig.dpi'])

Yep -- this is a bug in my view.  pylab.savefig and fig.avefig respect
the setting, but canvas.print_figure did not.  I updated the following
backends:

Sending        matplotlib/lib/matplotlib/backend_bases.py
Sending        matplotlib/lib/matplotlib/backends/backend_agg.py
Sending        matplotlib/lib/matplotlib/backends/backend_fltkagg.py
Sending        matplotlib/lib/matplotlib/backends/backend_gtk.py
Sending        matplotlib/lib/matplotlib/backends/backend_gtkagg.py
Sending        matplotlib/lib/matplotlib/backends/backend_qt4agg.py
Sending        matplotlib/lib/matplotlib/backends/backend_qtagg.py
Sending        matplotlib/lib/matplotlib/backends/backend_template.py
Sending        matplotlib/lib/matplotlib/backends/backend_tkagg.py
Sending        matplotlib/lib/matplotlib/backends/backend_wx.py
Sending        matplotlib/lib/matplotlib/backends/backend_wxagg.py
Sending        matplotlib/lib/matplotlib/figure.py

Those of you with svn access please give it a test drive on your
favorite backends to make sure it is behaving properly.  I was able to
test several...

JDH