adding a slight change to alfa func, + adding more tests

mapbox / nodata

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

MIT License

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adding a slight change to alfa func, + adding more tests #49

Closed dnomadb closed 9 years ago

dnomadb commented 9 years ago

Using the --alphafy flag resulted in a 4-band image w/ nodata == input nodata (which did not unearth a visual problem because RGBA w/ ndv == RGBA w/o it). Added functionality + tests