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Per-band unscaling works with indexes #709

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Per-band unscaling works with indexes #709

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4 changes: 2 additions & 2 deletions rio_tiler/reader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -263,8 +263,8 @@ def read(
data = data.astype("float32", casting="unsafe")

# reshaped to match data
scales = numpy.array(dataset.scales).reshape(-1, 1, 1)
offsets = numpy.array(dataset.offsets).reshape(-1, 1, 1)
scales = numpy.array(dataset.scales)[numpy.array(indexes)-1].reshape((-1, 1, 1))
offsets = numpy.array(dataset.offsets)[numpy.array(indexes)-1].reshape((-1, 1, 1))

numpy.multiply(data, scales, out=data, casting="unsafe")
numpy.add(data, offsets, out=data, casting="unsafe")
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4 changes: 4 additions & 0 deletions tests/test_io_rasterio.py
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Expand Up @@ -440,6 +440,10 @@ def test_Reader_Options():
p = src.point(310000, 4100000, coord_crs=src.dataset.crs)
numpy.testing.assert_allclose(p.data, [1000.892, 2008.917], atol=1e-03)

# applies correctly when passing indexes=[...]
p = src.point(310000, 4100000, coord_crs=src.dataset.crs, indexes=[2])
numpy.testing.assert_allclose(p.data, [2008.917], atol=1e-03)

# passing unscale in method should overwrite the defaults
p = src.point(310000, 4100000, coord_crs=src.dataset.crs, unscale=False)
numpy.testing.assert_equal(p.data, [8917, 8917])
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