Retina support for matplotlib backend

It would be nice if holoviews can support retina display using the %output magic:

%output fig='retina'

When working with matplotlib using the inline backend, retina display can be supported by %config magic:

%config InlineBackend.figure_format='retina'

sadly, holoviews ignores this configuration.

If anyone knows how to support retina display when using holoviews with matplotlib, please give me a hint. Thank you very much!

[jlstevens]

@philippjfr Would it make sense to support hv.output(dpi='retina') which would be respected by the matplotlib backend (and the bokeh/plotly backends too if it makes sense?)

[maximlt]

Just writing notes here after look at this for a little while. The HoloViews Pane of Panel as now a high_dpi parameter that is set to True by default. However:

• HoloViews doesn’t render Matplotlib plots with Panel, the _render_with_panel class attribute of the MPLRenderer is not set to True and the only format declared as supported to render with Panel is html.
• If HoloViews were to use the HoloViews Pane under the hood to render plots, it seems like the Pane doesn’t pick up the current dpi (set by hv.output(dpi=xxx) for instance)