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"""Test FEI SEM image plugin functionality.
FEI TIFFs contain metadata as ASCII plaintext at the end of the file.
"""
from __future__ import unicode_literals
import pytest
import numpy as np
import imageio
def test_fei_file_reading(test_images):
fei_filename = test_images / "fei-sem-rbc.tif"
reader = imageio.get_reader(fei_filename, format="fei")
image = reader.get_data(0) # imageio.Image object
assert image.shape == (1024, 1536)
assert np.round(np.mean(image)) == 142
assert len(image.meta) == 18
assert image.meta["EScan"]["PixelHeight"] == 7.70833e-009
assert isinstance(image.meta["Image"]["ResolutionX"], int)
image_with_watermark = reader.get_data(0, discard_watermark=False)
assert image_with_watermark.shape == (1094, 1536)
assert np.round(np.mean(image_with_watermark)) == 137
assert reader.get_data(0, discard_watermark=False).shape == (1094, 1536)
def test_fei_file_fail(tmp_path):
normal_tif = tmp_path / "test_tiff.tiff"
imageio.imsave(normal_tif, np.zeros((5, 5), dtype=np.uint8))
bad_reader = imageio.get_reader(normal_tif, format="fei")
with pytest.raises(ValueError):
bad_reader._get_meta_data()
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