read InlineBackend defaults in set_matplotlib_formats

IPython/core/display.py

@@ -729,20 +729,26 b' def set_matplotlib_formats(*formats, **kwargs):'
 
     To set this in your config files use the following::
     
-        c.InlineBackend.figure_formats = {'pdf', 'png', 'svg'}
-        c.InlineBackend.quality = 90
+        c.InlineBackend.figure_formats = {'png', 'jpeg'}
+        c.InlineBackend.print_figure_kwargs.update({'quality' : 90})
 
     Parameters
     ----------
-    *formats : list, tuple
-        One or a set of figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.
-    quality : int
-        A percentage for the quality of JPEG figures. Defaults to 90.
+    *formats : strs
+        One or more figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.
+    **kwargs :
+        Keyword args will be relayed to ``figure.canvas.print_figure``.
     """
     from IPython.core.interactiveshell import InteractiveShell
     from IPython.core.pylabtools import select_figure_formats
+    from IPython.kernel.zmq.pylab.config import InlineBackend
+    # build kwargs, starting with InlineBackend config
+    kw = {}
+    cfg = InlineBackend.instance()
+    kw.update(cfg.print_figure_kwargs)
+    kw.update(**kwargs)
     shell = InteractiveShell.instance()
-    select_figure_formats(shell, formats, quality=90)
+    select_figure_formats(shell, formats, **kw)
 
 @skip_doctest
 def set_matplotlib_close(close):