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257 lines
9.3 KiB
Python
257 lines
9.3 KiB
Python
import io
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import struct
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from PIL import Image, TiffImagePlugin, TiffTags
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from PIL.TiffImagePlugin import IFDRational, _limit_rational
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from .helper import PillowTestCase, hopper
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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], (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], (8, len(bindata) - 8))
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self.assertEqual(loaded.tag_v2[ImageJMetaDataByteCounts], (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(
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{
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"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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},
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img.tag_v2.named(),
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)
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self.assertEqual(
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{
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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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img.tag.named(),
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)
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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(
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IFDRational(*_limit_rational(elt, 2 ** 31)) for elt in v
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)
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ignored = ["StripByteCounts", "RowsPerStrip", "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) and isinstance(
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original[tag][0], IFDRational
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):
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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(
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original[tag],
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value,
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"%s didn't roundtrip, %s, %s" % (tag, original[tag], value),
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)
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else:
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self.assertEqual(
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original[tag],
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value,
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"%s didn't roundtrip, %s, %s" % (tag, original[tag], value),
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)
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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(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_empty_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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)
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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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