Pillow/Tests/test_file_jpeg2k.py

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from helper import unittest, PillowTestCase
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from PIL import Image, Jpeg2KImagePlugin
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from io import BytesIO
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codecs = dir(Image.core)
test_card = Image.open('Tests/images/test-card.png')
test_card.load()
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# OpenJPEG 2.0.0 outputs this debugging message sometimes; we should
# ignore it---it doesn't represent a test failure.
# 'Not enough memory to handle tile data'
class TestFileJpeg2k(PillowTestCase):
def setUp(self):
if "jpeg2k_encoder" not in codecs or "jpeg2k_decoder" not in codecs:
self.skipTest('JPEG 2000 support not available')
def roundtrip(self, im, **options):
out = BytesIO()
im.save(out, "JPEG2000", **options)
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test_bytes = out.tell()
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out.seek(0)
im = Image.open(out)
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im.bytes = test_bytes # for testing only
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im.load()
return im
def test_sanity(self):
# Internal version number
self.assertRegexpMatches(Image.core.jp2klib_version, '\d+\.\d+\.\d+$')
im = Image.open('Tests/images/test-card-lossless.jp2')
px = im.load()
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self.assertEqual(px[0,0], (0, 0, 0))
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self.assertEqual(im.mode, 'RGB')
self.assertEqual(im.size, (640, 480))
self.assertEqual(im.format, 'JPEG2000')
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def test_invalid_file(self):
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invalid_file = "Tests/images/flower.jpg"
self.assertRaises(SyntaxError,
lambda:
Jpeg2KImagePlugin.Jpeg2KImageFile(invalid_file))
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def test_bytesio(self):
with open('Tests/images/test-card-lossless.jp2', 'rb') as f:
data = BytesIO(f.read())
im = Image.open(data)
im.load()
self.assert_image_similar(im, test_card, 1.0e-3)
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# These two test pre-written JPEG 2000 files that were not written with
# PIL (they were made using Adobe Photoshop)
def test_lossless(self):
im = Image.open('Tests/images/test-card-lossless.jp2')
im.load()
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outfile = self.tempfile('temp_test-card.png')
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im.save(outfile)
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self.assert_image_similar(im, test_card, 1.0e-3)
def test_lossy_tiled(self):
im = Image.open('Tests/images/test-card-lossy-tiled.jp2')
im.load()
self.assert_image_similar(im, test_card, 2.0)
def test_lossless_rt(self):
im = self.roundtrip(test_card)
self.assert_image_equal(im, test_card)
def test_lossy_rt(self):
im = self.roundtrip(test_card, quality_layers=[20])
self.assert_image_similar(im, test_card, 2.0)
def test_tiled_rt(self):
im = self.roundtrip(test_card, tile_size=(128, 128))
self.assert_image_equal(im, test_card)
def test_tiled_offset_rt(self):
im = self.roundtrip(
test_card, tile_size=(128, 128),
tile_offset=(0, 0), offset=(32, 32))
self.assert_image_equal(im, test_card)
def test_irreversible_rt(self):
im = self.roundtrip(test_card, irreversible=True, quality_layers=[20])
self.assert_image_similar(im, test_card, 2.0)
def test_prog_qual_rt(self):
im = self.roundtrip(
test_card, quality_layers=[60, 40, 20], progression='LRCP')
self.assert_image_similar(im, test_card, 2.0)
def test_prog_res_rt(self):
im = self.roundtrip(test_card, num_resolutions=8, progression='RLCP')
self.assert_image_equal(im, test_card)
def test_reduce(self):
im = Image.open('Tests/images/test-card-lossless.jp2')
im.reduce = 2
im.load()
self.assertEqual(im.size, (160, 120))
def test_layers(self):
out = BytesIO()
test_card.save(out, 'JPEG2000', quality_layers=[100, 50, 10],
progression='LRCP')
out.seek(0)
im = Image.open(out)
im.layers = 1
im.load()
self.assert_image_similar(im, test_card, 13)
out.seek(0)
im = Image.open(out)
im.layers = 3
im.load()
self.assert_image_similar(im, test_card, 0.4)
def test_rgba(self):
# Arrange
j2k = Image.open('Tests/images/rgb_trns_ycbc.j2k')
jp2 = Image.open('Tests/images/rgb_trns_ycbc.jp2')
# Act
j2k.load()
jp2.load()
# Assert
self.assertEqual(j2k.mode, 'RGBA')
self.assertEqual(jp2.mode, 'RGBA')
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def test_16bit_monochrome_has_correct_mode(self):
j2k = Image.open('Tests/images/16bit.cropped.j2k')
jp2 = Image.open('Tests/images/16bit.cropped.jp2')
j2k.load()
jp2.load()
self.assertEqual(j2k.mode, 'I;16')
self.assertEqual(jp2.mode, 'I;16')
def test_16bit_monchrome_jp2_like_tiff(self):
tiff_16bit = Image.open('Tests/images/16bit.cropped.tif')
jp2 = Image.open('Tests/images/16bit.cropped.jp2')
self.assert_image_similar(jp2, tiff_16bit, 1e-3)
def test_16bit_monchrome_j2k_like_tiff(self):
tiff_16bit = Image.open('Tests/images/16bit.cropped.tif')
j2k = Image.open('Tests/images/16bit.cropped.j2k')
self.assert_image_similar(j2k, tiff_16bit, 1e-3)
def test_16bit_j2k_roundtrips(self):
j2k = Image.open('Tests/images/16bit.cropped.j2k')
im = self.roundtrip(j2k)
self.assert_image_equal(im, j2k)
def test_16bit_jp2_roundtrips(self):
jp2 = Image.open('Tests/images/16bit.cropped.jp2')
im = self.roundtrip(jp2)
self.assert_image_equal(im, jp2)
def test_unbound_local(self):
# prepatch, a malformed jp2 file could cause an UnboundLocalError
# exception.
try:
jp2 = Image.open('Tests/images/unbound_variable.jp2')
self.assertTrue(False, 'Expecting an exception')
except SyntaxError as err:
self.assertTrue(True, 'Expecting a syntax error')
except IOError as err:
self.assertTrue(True, 'Expecting an IO error')
except UnboundLocalError as err:
self.assertTrue(False, "Prepatch error")
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if __name__ == '__main__':
unittest.main()