transparent option for rasterize?

When I use datashade I get the transparent background that lets me see the WMTS tiles

but when I use rasterize, I get grey instead of transparent

and I can’t figure out how to fix it.

I did try to figure this out by googling and looking in docs and code, but failed… 😞

[philippjfr]

A transparent background is actually the default when using GeoViews, i.e. if you were to switch to gv.TriMesh on the input to rasterize it would return a gv.Image (as long as you are using master of hv and gv), which uses a transparent color for NaN values. This was a deliberate choice because when plotting non-geographic data you often do want to see the nan values, but I’d be happy to have this discussion again.

To override the default NaN color to be transparent you can set clipping_colors={'NaN': (0, 0, 0, 0)} as a plot option. This will be covered properly in the new “Styling Plots” user guide being added in https://github.com/ioam/holoviews/pull/2483.

[jbednar]

Personally, I don’t care about shorter in this case, I care about clearer, and transparent is vastly clearer than (0,0,0,0) and slightly clearer than clear (no pun intended).