DOC: mention scale_factor in documentation
@@ -51,6 +51,17 @@ Firefox, which requires the following:
Once those dependencies are installed, you should be able to save charts as
``png`` or ``svg``.
+Figure Size/Resolution
+^^^^^^^^^^^^^^^^^^^^^^
+When using ``chart.save()`` above, the resolution of the resulting PNG is
+controlled by the resolution of your screen. The easiest way to produce a
+higher-resolution PNG image is to scale the image to make it larger, and thus
+to contain more pixels at a given resolution.
+
+This can be done with the ``scale_factor`` argument, which defaults to 1.0::
+
+ chart.save('chart.png', scale_factor=2.0)
+
.. saving-json:
JSON format
