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93abbd0caa
To have the old API that always returns tuples, and fractions as pairs, set the `legacy_api` attribute of the IFD to True. This should alleviate concerns about backwards compatibility.
130 lines
4.6 KiB
Python
130 lines
4.6 KiB
Python
from __future__ import division
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from helper import unittest, PillowTestCase, hopper
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from PIL import Image, TiffImagePlugin, TiffTags
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tag_ids = dict((info.name, info.value) for info in TiffTags.TAGS.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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basetextdata = "This is some arbitrary metadata for a text field"
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textdata = basetextdata + " \xff"
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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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info[tag_ids['ImageJMetaDataByteCounts']] = len(textdata)
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info[tag_ids['ImageJMetaData']] = textdata
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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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f = self.tempfile("temp.tif")
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img.save(f, tiffinfo=info)
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for legacy_api in [False, True]:
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loaded = Image.open(f)
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loaded.tag.legacy_api = legacy_api
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self.assertEqual(loaded.tag[50838],
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(len(basetextdata + " ?"),) if legacy_api else len(basetextdata + " ?"))
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self.assertEqual(loaded.tag[50839], basetextdata + " ?")
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loaded_float = loaded.tag[tag_ids['RollAngle']]
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if legacy_api:
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loaded_float = loaded_float[0]
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self.assertAlmostEqual(loaded_float, floatdata, places=5)
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loaded_double = loaded.tag[tag_ids['YawAngle']]
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if legacy_api:
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loaded_double = loaded_double[0]
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self.assertAlmostEqual(loaded_double, doubledata)
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def test_read_metadata(self):
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for legacy_api in [False, True]:
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img = Image.open('Tests/images/hopper_g4.tif')
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img.tag.legacy_api = legacy_api
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known = {'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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} if legacy_api else {
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'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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}
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self.assertEqual(known, 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.named()
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reloaded = loaded.tag.named()
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ignored = [
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'StripByteCounts', 'RowsPerStrip', 'PageNumber', 'StripOffsets']
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for tag, value in reloaded.items():
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if tag not in ignored:
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self.assertEqual(
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original[tag], value, "%s didn't roundtrip" % tag)
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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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if __name__ == '__main__':
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unittest.main()
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# End of file
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