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4de5477b61
With the introduction and use of pytest, it is simple and easy to
execute specific tests in isolation through documented command line
arguments. Either by specifying the module path or through the `-k
EXPRESSION` argument. There is no longer any need to provide the
boilerplate:
if __name__ == '__main__':
unittest.main()
To every test file. It is simply noise.
The pattern remains in test files that aren't named with `test_*` as
those files are not discovered and executed by pytest by default.
250 lines
9.7 KiB
Python
250 lines
9.7 KiB
Python
import io
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import struct
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from .helper import PillowTestCase, hopper
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from PIL import Image, TiffImagePlugin, TiffTags
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from PIL.TiffImagePlugin import _limit_rational, IFDRational
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tag_ids = {info.name: info.value for info in TiffTags.TAGS_V2.values()}
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class TestFileTiffMetadata(PillowTestCase):
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def test_rt_metadata(self):
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""" Test writing arbitrary metadata into the tiff image directory
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Use case is ImageJ private tags, one numeric, one arbitrary
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data. https://github.com/python-pillow/Pillow/issues/291
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"""
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img = hopper()
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# Behaviour change: re #1416
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# Pre ifd rewrite, ImageJMetaData was being written as a string(2),
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# Post ifd rewrite, it's defined as arbitrary bytes(7). It should
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# roundtrip with the actual bytes, rather than stripped text
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# of the premerge tests.
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#
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# For text items, we still have to decode('ascii','replace') because
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# the tiff file format can't take 8 bit bytes in that field.
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basetextdata = "This is some arbitrary metadata for a text field"
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bindata = basetextdata.encode('ascii') + b" \xff"
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textdata = basetextdata + " " + chr(255)
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reloaded_textdata = basetextdata + " ?"
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floatdata = 12.345
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doubledata = 67.89
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info = TiffImagePlugin.ImageFileDirectory()
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ImageJMetaData = tag_ids['ImageJMetaData']
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ImageJMetaDataByteCounts = tag_ids['ImageJMetaDataByteCounts']
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ImageDescription = tag_ids['ImageDescription']
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info[ImageJMetaDataByteCounts] = len(bindata)
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info[ImageJMetaData] = bindata
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info[tag_ids['RollAngle']] = floatdata
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info.tagtype[tag_ids['RollAngle']] = 11
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info[tag_ids['YawAngle']] = doubledata
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info.tagtype[tag_ids['YawAngle']] = 12
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info[ImageDescription] = textdata
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f = self.tempfile("temp.tif")
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img.save(f, tiffinfo=info)
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loaded = Image.open(f)
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self.assertEqual(loaded.tag[ImageJMetaDataByteCounts], (len(bindata),))
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self.assertEqual(loaded.tag_v2[ImageJMetaDataByteCounts],
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(len(bindata),))
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self.assertEqual(loaded.tag[ImageJMetaData], bindata)
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self.assertEqual(loaded.tag_v2[ImageJMetaData], bindata)
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self.assertEqual(loaded.tag[ImageDescription], (reloaded_textdata,))
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self.assertEqual(loaded.tag_v2[ImageDescription], reloaded_textdata)
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loaded_float = loaded.tag[tag_ids['RollAngle']][0]
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self.assertAlmostEqual(loaded_float, floatdata, places=5)
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loaded_double = loaded.tag[tag_ids['YawAngle']][0]
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self.assertAlmostEqual(loaded_double, doubledata)
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# check with 2 element ImageJMetaDataByteCounts, issue #2006
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info[ImageJMetaDataByteCounts] = (8, len(bindata) - 8)
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img.save(f, tiffinfo=info)
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loaded = Image.open(f)
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self.assertEqual(loaded.tag[ImageJMetaDataByteCounts],
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(8, len(bindata) - 8))
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self.assertEqual(loaded.tag_v2[ImageJMetaDataByteCounts],
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(8, len(bindata) - 8))
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def test_read_metadata(self):
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img = Image.open('Tests/images/hopper_g4.tif')
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self.assertEqual({'YResolution': IFDRational(4294967295, 113653537),
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'PlanarConfiguration': 1,
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'BitsPerSample': (1,),
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'ImageLength': 128,
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'Compression': 4,
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'FillOrder': 1,
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'RowsPerStrip': 128,
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'ResolutionUnit': 3,
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'PhotometricInterpretation': 0,
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'PageNumber': (0, 1),
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'XResolution': IFDRational(4294967295, 113653537),
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'ImageWidth': 128,
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'Orientation': 1,
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'StripByteCounts': (1968,),
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'SamplesPerPixel': 1,
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'StripOffsets': (8,)
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}, img.tag_v2.named())
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self.assertEqual({'YResolution': ((4294967295, 113653537),),
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'PlanarConfiguration': (1,),
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'BitsPerSample': (1,),
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'ImageLength': (128,),
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'Compression': (4,),
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'FillOrder': (1,),
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'RowsPerStrip': (128,),
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'ResolutionUnit': (3,),
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'PhotometricInterpretation': (0,),
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'PageNumber': (0, 1),
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'XResolution': ((4294967295, 113653537),),
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'ImageWidth': (128,),
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'Orientation': (1,),
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'StripByteCounts': (1968,),
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'SamplesPerPixel': (1,),
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'StripOffsets': (8,)
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}, img.tag.named())
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def test_write_metadata(self):
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""" Test metadata writing through the python code """
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img = Image.open('Tests/images/hopper.tif')
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f = self.tempfile('temp.tiff')
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img.save(f, tiffinfo=img.tag)
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loaded = Image.open(f)
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original = img.tag_v2.named()
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reloaded = loaded.tag_v2.named()
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for k, v in original.items():
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if isinstance(v, IFDRational):
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original[k] = IFDRational(*_limit_rational(v, 2**31))
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elif isinstance(v, tuple) and isinstance(v[0], IFDRational):
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original[k] = tuple(IFDRational(*_limit_rational(elt, 2**31))
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for elt in v)
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ignored = ['StripByteCounts', 'RowsPerStrip',
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'PageNumber', 'StripOffsets']
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for tag, value in reloaded.items():
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if tag in ignored:
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continue
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if (isinstance(original[tag], tuple)
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and isinstance(original[tag][0], IFDRational)):
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# Need to compare element by element in the tuple,
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# not comparing tuples of object references
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self.assert_deep_equal(original[tag],
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value,
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"%s didn't roundtrip, %s, %s" %
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(tag, original[tag], value))
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else:
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self.assertEqual(original[tag],
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value,
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"%s didn't roundtrip, %s, %s" %
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(tag, original[tag], value))
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for tag, value in original.items():
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if tag not in ignored:
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self.assertEqual(
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value, reloaded[tag], "%s didn't roundtrip" % tag)
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def test_no_duplicate_50741_tag(self):
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self.assertEqual(tag_ids['MakerNoteSafety'], 50741)
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self.assertEqual(tag_ids['BestQualityScale'], 50780)
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def test_empty_metadata(self):
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f = io.BytesIO(b'II*\x00\x08\x00\x00\x00')
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head = f.read(8)
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info = TiffImagePlugin.ImageFileDirectory(head)
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# Should not raise struct.error.
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self.assert_warning(UserWarning, info.load, f)
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def test_iccprofile(self):
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# https://github.com/python-pillow/Pillow/issues/1462
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im = Image.open('Tests/images/hopper.iccprofile.tif')
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out = self.tempfile('temp.tiff')
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im.save(out)
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reloaded = Image.open(out)
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self.assertNotIsInstance(im.info['icc_profile'], tuple)
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self.assertEqual(im.info['icc_profile'], reloaded.info['icc_profile'])
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def test_iccprofile_binary(self):
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# https://github.com/python-pillow/Pillow/issues/1526
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# We should be able to load this,
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# but probably won't be able to save it.
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im = Image.open('Tests/images/hopper.iccprofile_binary.tif')
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self.assertEqual(im.tag_v2.tagtype[34675], 1)
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self.assertTrue(im.info['icc_profile'])
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def test_iccprofile_save_png(self):
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im = Image.open('Tests/images/hopper.iccprofile.tif')
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outfile = self.tempfile('temp.png')
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im.save(outfile)
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def test_iccprofile_binary_save_png(self):
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im = Image.open('Tests/images/hopper.iccprofile_binary.tif')
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outfile = self.tempfile('temp.png')
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im.save(outfile)
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def test_exif_div_zero(self):
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im = hopper()
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info = TiffImagePlugin.ImageFileDirectory_v2()
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info[41988] = TiffImagePlugin.IFDRational(0, 0)
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out = self.tempfile('temp.tiff')
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im.save(out, tiffinfo=info, compression='raw')
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reloaded = Image.open(out)
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self.assertEqual(0, reloaded.tag_v2[41988].numerator)
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self.assertEqual(0, reloaded.tag_v2[41988].denominator)
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def test_expty_values(self):
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data = io.BytesIO(
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b'II*\x00\x08\x00\x00\x00\x03\x00\x1a\x01\x05\x00\x00\x00\x00\x00'
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b'\x00\x00\x00\x00\x1b\x01\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00'
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b'\x98\x82\x02\x00\x07\x00\x00\x002\x00\x00\x00\x00\x00\x00\x00a '
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b'text\x00\x00')
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head = data.read(8)
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info = TiffImagePlugin.ImageFileDirectory_v2(head)
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info.load(data)
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# Should not raise ValueError.
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info = dict(info)
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self.assertIn(33432, info)
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def test_PhotoshopInfo(self):
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im = Image.open('Tests/images/issue_2278.tif')
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self.assertIsInstance(im.tag_v2[34377], bytes)
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out = self.tempfile('temp.tiff')
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im.save(out)
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reloaded = Image.open(out)
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self.assertIsInstance(reloaded.tag_v2[34377], bytes)
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def test_too_many_entries(self):
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ifd = TiffImagePlugin.ImageFileDirectory_v2()
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# 277: ("SamplesPerPixel", SHORT, 1),
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ifd._tagdata[277] = struct.pack('hh', 4, 4)
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ifd.tagtype[277] = TiffTags.SHORT
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# Should not raise ValueError.
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self.assert_warning(UserWarning, lambda: ifd[277])
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