Pillow/Tests/test_file_tiff_metadata.py

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from helper import unittest, PillowTestCase, tearDownModule, lena
from PIL import Image, TiffImagePlugin, TiffTags
tag_ids = dict(zip(TiffTags.TAGS.values(), TiffTags.TAGS.keys()))
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class TestFileTiffMetadata(PillowTestCase):
def test_rt_metadata(self):
""" Test writing arbitray metadata into the tiff image directory
Use case is ImageJ private tags, one numeric, one arbitrary
data. https://github.com/python-pillow/Pillow/issues/291
"""
img = lena()
textdata = "This is some arbitrary metadata for a text field"
info = TiffImagePlugin.ImageFileDirectory()
info[tag_ids['ImageJMetaDataByteCounts']] = len(textdata)
info[tag_ids['ImageJMetaData']] = 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[50838], (len(textdata),))
self.assertEqual(loaded.tag[50839], textdata)
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def test_read_metadata(self):
img = Image.open('Tests/images/lena_g4.tif')
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known = {'YResolution': ((1207959552, 16777216),),
'PlanarConfiguration': (1,),
'BitsPerSample': (1,),
'ImageLength': (128,),
'Compression': (4,),
'FillOrder': (1,),
'DocumentName': 'lena.g4.tif',
'RowsPerStrip': (128,),
'ResolutionUnit': (1,),
'PhotometricInterpretation': (0,),
'PageNumber': (0, 1),
'XResolution': ((1207959552, 16777216),),
'ImageWidth': (128,),
'Orientation': (1,),
'StripByteCounts': (1796,),
'SamplesPerPixel': (1,),
'StripOffsets': (8,),
'Software': 'ImageMagick 6.5.7-8 2012-08-17 Q16 http://www.imagemagick.org'}
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# self.assertEqual is equivalent,
# but less helpful in telling what's wrong.
named = img.tag.named()
for tag, value in named.items():
self.assertEqual(known[tag], value)
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for tag, value in known.items():
self.assertEqual(value, named[tag])
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def test_write_metadata(self):
""" Test metadata writing through the python code """
img = Image.open('Tests/images/lena.tif')
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f = self.tempfile('temp.tiff')
img.save(f, tiffinfo=img.tag)
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loaded = Image.open(f)
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original = img.tag.named()
reloaded = loaded.tag.named()
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ignored = [
'StripByteCounts', 'RowsPerStrip', 'PageNumber', 'StripOffsets']
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for tag, value in reloaded.items():
if tag not in ignored:
self.assertEqual(
original[tag], value, "%s didn't roundtrip" % tag)
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for tag, value in original.items():
if tag not in ignored:
self.assertEqual(
value, reloaded[tag], "%s didn't roundtrip" % tag)
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if __name__ == '__main__':
unittest.main()
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# End of file