79 lines
2.1 KiB
Python
79 lines
2.1 KiB
Python
from tempfile import NamedTemporaryFile
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import pytest
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import numpy as np
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from skimage.io import imread, imsave, use_plugin, reset_plugins
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from skimage._shared import testing
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from skimage._shared.testing import assert_array_almost_equal, TestCase, fetch
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from skimage._shared._warnings import expected_warnings
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def setup():
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use_plugin('imageio')
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def teardown():
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reset_plugins()
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def test_imageio_as_gray():
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img = imread(fetch('data/color.png'), as_gray=True)
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assert img.ndim == 2
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assert img.dtype == np.float64
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img = imread(fetch('data/camera.png'), as_gray=True)
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# check that conversion does not happen for a gray image
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assert np.sctype2char(img.dtype) in np.typecodes['AllInteger']
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def test_imageio_palette():
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img = imread(fetch('data/palette_color.png'))
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assert img.ndim == 3
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def test_imageio_truncated_jpg():
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# imageio>2.0 uses Pillow / PIL to try and load the file.
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# Oddly, PIL explicitly raises a SyntaxError when the file read fails.
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with testing.raises(SyntaxError):
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imread(fetch('data/truncated.jpg'))
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class TestSave(TestCase):
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def roundtrip(self, x, scaling=1):
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f = NamedTemporaryFile(suffix='.png')
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fname = f.name
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f.close()
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imsave(fname, x)
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y = imread(fname)
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assert_array_almost_equal((x * scaling).astype(np.int32), y)
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def test_imsave_roundtrip(self):
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dtype = np.uint8
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np.random.seed(0)
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for shape in [(10, 10), (10, 10, 3), (10, 10, 4)]:
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x = np.ones(shape, dtype=dtype) * np.random.rand(*shape)
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if np.issubdtype(dtype, np.floating):
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yield self.roundtrip, x, 255
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else:
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x = (x * 255).astype(dtype)
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yield self.roundtrip, x
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def test_bool_array_save(self):
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f = NamedTemporaryFile(suffix='.png')
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fname = f.name
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f.close()
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with expected_warnings(['.* is a boolean image']):
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a = np.zeros((5, 5), bool)
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a[2, 2] = True
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imsave(fname, a)
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def test_return_class():
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testing.assert_equal(
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type(imread(fetch('data/color.png'))),
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np.ndarray
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)
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