robustify --alphafy option + add tests

mapbox / nodata

Because the pixels you can't see are harder than the ones you can.

MIT License

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Closed dnomadb closed 6 years ago

dnomadb commented 9 years ago

We'll be using --alphafy in pxm-composite to unset rgb nodata values; going to add a few specific test cases and robustify functionality as needed.

cc @yhahn @perrygeo

dnomadb commented 6 years ago

Stale, --alphafy has proved robust enough, no clear actions here