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add tests for subsampled jpeg2000 image decoding

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This commit is contained in:
nulano 2020-10-20 06:33:01 +01:00
parent 4f4c3b34f8
commit 2586b7ddef
1 changed files with 23 additions and 0 deletions
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23
Tests/test_file_jpeg2k.py
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@ -1,3 +1,4 @@
import os
import re import re
from io import BytesIO from io import BytesIO
@ -12,6 +13,8 @@ from .helper import (
skip_unless_feature, skip_unless_feature,
) )
EXTRA_DIR = "Tests/images/jpeg2000"
pytestmark = skip_unless_feature("jpg_2000") pytestmark = skip_unless_feature("jpg_2000")
test_card = Image.open("Tests/images/test-card.png") test_card = Image.open("Tests/images/test-card.png")
@ -233,3 +236,23 @@ def test_parser_feed():
# Assert # Assert
assert p.image.size == (640, 480) assert p.image.size == (640, 480)
@pytest.mark.skipif(
not os.path.exists(EXTRA_DIR), reason="Extra image files not installed"
)
@pytest.mark.parametrize("name", ("subsampling_1", "subsampling_2", "zoo1", "zoo2"))
def test_subsampling_decode(name):
test = f"{EXTRA_DIR}/{name}.jp2"
reference = f"{EXTRA_DIR}/{name}.ppm"
with Image.open(test) as im:
epsilon = 3 # for YCbCr images
with Image.open(reference) as im2:
width, height = im2.size
if name[-1] == "2":
# RGB reference images are downscaled
epsilon = 3e-3
width, height = width * 2, height * 2
expected = im2.resize((width, height), Image.NEAREST)
assert_image_similar(im, expected, epsilon)