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Correctly apply PNG palette when building ImageBase through Pillow. #14326

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Merged
merged 1 commit into from
May 27, 2019
Merged

Correctly apply PNG palette when building ImageBase through Pillow. #14326

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9 changes: 8 additions & 1 deletion lib/matplotlib/image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -665,8 +665,15 @@ def set_data(self, A):

Parameters
----------
A : array-like
A : array-like or `PIL.Image.Image`
"""
try:
from PIL import Image
except ImportError:
pass
else:
if isinstance(A, Image.Image):
A = pil_to_array(A) # Needed e.g. to apply png palette.
self._A = cbook.safe_masked_invalid(A, copy=True)

if (self._A.dtype != np.uint8 and
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17 changes: 11 additions & 6 deletions lib/matplotlib/tests/test_image.py
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Expand Up @@ -14,7 +14,7 @@
from numpy.testing import assert_array_equal

from matplotlib import (
colors, image as mimage, patches, pyplot as plt,
colors, image as mimage, patches, pyplot as plt, style,
rc_context, rcParams)
from matplotlib.cbook import MatplotlibDeprecationWarning
from matplotlib.image import (AxesImage, BboxImage, FigureImage,
Expand Down Expand Up @@ -117,11 +117,16 @@ def test_image_python_io():

@check_figures_equal()
def test_imshow_pil(fig_test, fig_ref):
pytest.importorskip("PIL")
img = plt.imread(os.path.join(os.path.dirname(__file__),
'baseline_images', 'test_image', 'uint16.tif'))
fig_test.subplots().imshow(img)
fig_ref.subplots().imshow(np.asarray(img))
style.use("default")
PIL = pytest.importorskip("PIL")
png_path = Path(__file__).parent / "baseline_images/pngsuite/basn3p04.png"
tiff_path = Path(__file__).parent / "baseline_images/test_image/uint16.tif"
axs = fig_test.subplots(2)
axs[0].imshow(PIL.Image.open(png_path))
axs[1].imshow(PIL.Image.open(tiff_path))
axs = fig_ref.subplots(2)
axs[0].imshow(plt.imread(str(png_path)))
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Looks good - why is this "str" here?

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because imread() doesn't support Path inputs for png only.

axs[1].imshow(plt.imread(tiff_path))


def test_imread_pil_uint16():
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