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108 lines
3.5 KiB
Python
108 lines
3.5 KiB
Python
from helper import unittest, PillowTestCase, hopper
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from PIL import Image, TiffImagePlugin, TiffTags
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tag_ids = dict(zip(TiffTags.TAGS.values(), TiffTags.TAGS.keys()))
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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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textdata = "This is some arbitrary metadata for a text field"
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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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loaded = Image.open(f)
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self.assertEqual(loaded.tag[50838], (len(textdata),))
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self.assertEqual(loaded.tag[50839], textdata)
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self.assertAlmostEqual(loaded.tag[tag_ids['RollAngle']][0], floatdata,
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places=5)
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self.assertAlmostEqual(loaded.tag[tag_ids['YawAngle']][0], doubledata)
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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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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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}
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# self.assertEqual is equivalent,
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# but less helpful in telling what's wrong.
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named = img.tag.named()
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for tag, value in named.items():
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self.assertEqual(known[tag], value)
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for tag, value in known.items():
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self.assertEqual(value, named[tag])
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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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