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156 lines
5.7 KiB
Python
156 lines
5.7 KiB
Python
from __future__ import division
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import io
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import struct
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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_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], 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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def test_read_metadata(self):
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img = Image.open('Tests/images/hopper_g4.tif')
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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_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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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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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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try:
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self.assert_warning(UserWarning, lambda: info.load(f))
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except struct.error:
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self.fail("Should not be struct errors there.")
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if __name__ == '__main__':
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unittest.main()
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# End of file
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