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Pillow/Tests/test_file_tiff_metadata.py
Eric Soroos c12b9fb4dc added test for metadata count warning
2017-09-19 10:35:14 +00:00

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import io
import struct
from helper import unittest, PillowTestCase, hopper
from PIL import Image, TiffImagePlugin, TiffTags
from PIL.TiffImagePlugin import _limit_rational, IFDRational
tag_ids = {info.name: info.value for info in TiffTags.TAGS_V2.values()}
class TestFileTiffMetadata(PillowTestCase):
def test_rt_metadata(self):
""" Test writing arbitrary 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 = hopper()
# Behaviour change: re #1416
# Pre ifd rewrite, ImageJMetaData was being written as a string(2),
# Post ifd rewrite, it's defined as arbitrary bytes(7). It should
# roundtrip with the actual bytes, rather than stripped text
# of the premerge tests.
#
# For text items, we still have to decode('ascii','replace') because
# the tiff file format can't take 8 bit bytes in that field.
basetextdata = "This is some arbitrary metadata for a text field"
bindata = basetextdata.encode('ascii') + b" \xff"
textdata = basetextdata + " " + chr(255)
reloaded_textdata = basetextdata + " ?"
floatdata = 12.345
doubledata = 67.89
info = TiffImagePlugin.ImageFileDirectory()
ImageJMetaData = tag_ids['ImageJMetaData']
ImageJMetaDataByteCounts = tag_ids['ImageJMetaDataByteCounts']
ImageDescription = tag_ids['ImageDescription']
info[ImageJMetaDataByteCounts] = len(bindata)
info[ImageJMetaData] = bindata
info[tag_ids['RollAngle']] = floatdata
info.tagtype[tag_ids['RollAngle']] = 11
info[tag_ids['YawAngle']] = doubledata
info.tagtype[tag_ids['YawAngle']] = 12
info[ImageDescription] = textdata
f = self.tempfile("temp.tif")
img.save(f, tiffinfo=info)
loaded = Image.open(f)
self.assertEqual(loaded.tag[ImageJMetaDataByteCounts], (len(bindata),))
self.assertEqual(loaded.tag_v2[ImageJMetaDataByteCounts], (len(bindata),))
self.assertEqual(loaded.tag[ImageJMetaData], bindata)
self.assertEqual(loaded.tag_v2[ImageJMetaData], bindata)
self.assertEqual(loaded.tag[ImageDescription], (reloaded_textdata,))
self.assertEqual(loaded.tag_v2[ImageDescription], reloaded_textdata)
loaded_float = loaded.tag[tag_ids['RollAngle']][0]
self.assertAlmostEqual(loaded_float, floatdata, places=5)
loaded_double = loaded.tag[tag_ids['YawAngle']][0]
self.assertAlmostEqual(loaded_double, doubledata)
# check with 2 element ImageJMetaDataByteCounts, issue #2006
info[ImageJMetaDataByteCounts] = (8, len(bindata) - 8)
img.save(f, tiffinfo=info)
loaded = Image.open(f)
self.assertEqual(loaded.tag[ImageJMetaDataByteCounts], (8, len(bindata) - 8))
self.assertEqual(loaded.tag_v2[ImageJMetaDataByteCounts], (8, len(bindata) - 8))
def test_read_metadata(self):
img = Image.open('Tests/images/hopper_g4.tif')
self.assertEqual({'YResolution': IFDRational(4294967295, 113653537),
'PlanarConfiguration': 1,
'BitsPerSample': (1,),
'ImageLength': 128,
'Compression': 4,
'FillOrder': 1,
'RowsPerStrip': 128,
'ResolutionUnit': 3,
'PhotometricInterpretation': 0,
'PageNumber': (0, 1),
'XResolution': IFDRational(4294967295, 113653537),
'ImageWidth': 128,
'Orientation': 1,
'StripByteCounts': (1968,),
'SamplesPerPixel': 1,
'StripOffsets': (8,)
}, img.tag_v2.named())
self.assertEqual({'YResolution': ((4294967295, 113653537),),
'PlanarConfiguration': (1,),
'BitsPerSample': (1,),
'ImageLength': (128,),
'Compression': (4,),
'FillOrder': (1,),
'RowsPerStrip': (128,),
'ResolutionUnit': (3,),
'PhotometricInterpretation': (0,),
'PageNumber': (0, 1),
'XResolution': ((4294967295, 113653537),),
'ImageWidth': (128,),
'Orientation': (1,),
'StripByteCounts': (1968,),
'SamplesPerPixel': (1,),
'StripOffsets': (8,)
}, img.tag.named())
def test_write_metadata(self):
""" Test metadata writing through the python code """
img = Image.open('Tests/images/hopper.tif')
f = self.tempfile('temp.tiff')
img.save(f, tiffinfo=img.tag)
loaded = Image.open(f)
original = img.tag_v2.named()
reloaded = loaded.tag_v2.named()
for k, v in original.items():
if isinstance(v, IFDRational):
original[k] = IFDRational(*_limit_rational(v, 2**31))
if isinstance(v, tuple) and isinstance(v[0], IFDRational):
original[k] = tuple([IFDRational(
*_limit_rational(elt, 2**31)) for elt in v])
ignored = ['StripByteCounts', 'RowsPerStrip',
'PageNumber', 'StripOffsets']
for tag, value in reloaded.items():
if tag in ignored:
continue
if (isinstance(original[tag], tuple)
and isinstance(original[tag][0], IFDRational)):
# Need to compare element by element in the tuple,
# not comparing tuples of object references
self.assert_deep_equal(original[tag],
value,
"%s didn't roundtrip, %s, %s" %
(tag, original[tag], value))
else:
self.assertEqual(original[tag],
value,
"%s didn't roundtrip, %s, %s" %
(tag, original[tag], value))
for tag, value in original.items():
if tag not in ignored:
self.assertEqual(
value, reloaded[tag], "%s didn't roundtrip" % tag)
def test_no_duplicate_50741_tag(self):
self.assertEqual(tag_ids['MakerNoteSafety'], 50741)
self.assertEqual(tag_ids['BestQualityScale'], 50780)
def test_empty_metadata(self):
f = io.BytesIO(b'II*\x00\x08\x00\x00\x00')
head = f.read(8)
info = TiffImagePlugin.ImageFileDirectory(head)
try:
self.assert_warning(UserWarning, info.load, f)
except struct.error:
self.fail("Should not be struct errors there.")
def test_iccprofile(self):
# https://github.com/python-pillow/Pillow/issues/1462
im = Image.open('Tests/images/hopper.iccprofile.tif')
out = self.tempfile('temp.tiff')
im.save(out)
reloaded = Image.open(out)
self.assertNotIsInstance(im.info['icc_profile'], tuple)
self.assertEqual(im.info['icc_profile'], reloaded.info['icc_profile'])
def test_iccprofile_binary(self):
# https://github.com/python-pillow/Pillow/issues/1526
# We should be able to load this, but probably won't be able to save it.
im = Image.open('Tests/images/hopper.iccprofile_binary.tif')
self.assertEqual(im.tag_v2.tagtype[34675], 1)
self.assertTrue(im.info['icc_profile'])
def test_iccprofile_save_png(self):
im = Image.open('Tests/images/hopper.iccprofile.tif')
outfile = self.tempfile('temp.png')
im.save(outfile)
def test_iccprofile_binary_save_png(self):
im = Image.open('Tests/images/hopper.iccprofile_binary.tif')
outfile = self.tempfile('temp.png')
im.save(outfile)
def test_exif_div_zero(self):
im = hopper()
info = TiffImagePlugin.ImageFileDirectory_v2()
info[41988] = TiffImagePlugin.IFDRational(0, 0)
out = self.tempfile('temp.tiff')
im.save(out, tiffinfo=info, compression='raw')
reloaded = Image.open(out)
self.assertEqual(0, reloaded.tag_v2[41988].numerator)
self.assertEqual(0, reloaded.tag_v2[41988].denominator)
def test_expty_values(self):
data = io.BytesIO(
b'II*\x00\x08\x00\x00\x00\x03\x00\x1a\x01\x05\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x1b\x01\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x98\x82\x02\x00\x07\x00\x00\x002\x00\x00\x00\x00\x00\x00\x00a '
b'text\x00\x00')
head = data.read(8)
info = TiffImagePlugin.ImageFileDirectory_v2(head)
info.load(data)
try:
info = dict(info)
except ValueError:
self.fail("Should not be struct value error there.")
self.assertIn(33432, info)
def test_PhotoshopInfo(self):
im = Image.open('Tests/images/issue_2278.tif')
self.assertIsInstance(im.tag_v2[34377], bytes)
out = self.tempfile('temp.tiff')
im.save(out)
reloaded = Image.open(out)
self.assertIsInstance(reloaded.tag_v2[34377], bytes)
def test_too_many_entries(self):
ifd = TiffImagePlugin.ImageFileDirectory_v2()
# 277: ("SamplesPerPixel", SHORT, 1),
ifd._tagdata[277] = struct.pack('hh', 4,4)
ifd.tagtype[277] = TiffTags.SHORT
try:
self.assert_warning(UserWarning, lambda: ifd[277])
except ValueError:
self.fail("Invalid Metadata count should not cause a Value Error.")
if __name__ == '__main__':
unittest.main()
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