Adding coastlines does not preserve transparency

[adybbroe]

When adding coast lines to an image the image is no more transparent. Perhaps this is inevitable, as I guess the coastlines/overlay is stored to the alpha channel?

See e.g. the example at
pytroll-examples/satpy/viirs_smoke.ipynb

[adybbroe]

I am pretty sure this is no more an issue! Right?

[djhoese]

Looks good to me:

Edit: For the record, here's the code I ran:

from satpy import Scene; from glob import glob

scn = Scene(reader='viirs_sdr', filenames=glob('/data/satellite/viirs/conus_day/*t180[1234]*.h5'))
scn.load(['true_color'])
new_scn = scn.resample('moll')
new_scn.show('true_color', overlay={'coast_dir': '/data/gshhg_shapefiles/', 'color': (255, 140, 100)})

[adybbroe]

Thanks @djhoese !