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81 lines
2.5 KiB
Python
81 lines
2.5 KiB
Python
from tester import *
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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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def test_rt_metadata():
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""" Test writing arbitray 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-imaging/Pillow/issues/291
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"""
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img = lena()
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textdata = "This is some arbitrary metadata for a text field"
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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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f = tempfile("temp.tif")
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img.save(f, tiffinfo=info)
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loaded = Image.open(f)
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assert_equal(loaded.tag[50838], (len(textdata),))
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assert_equal(loaded.tag[50839], textdata)
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def test_read_metadata():
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img = Image.open('Tests/images/lena_g4.tif')
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known = {'YResolution': ((1207959552, 16777216),),
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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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'DocumentName': 'lena.g4.tif',
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'RowsPerStrip': (128,),
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'ResolutionUnit': (1,),
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'PhotometricInterpretation': (0,),
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'PageNumber': (0, 1),
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'XResolution': ((1207959552, 16777216),),
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'ImageWidth': (128,),
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'Orientation': (1,),
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'StripByteCounts': (1796,),
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'SamplesPerPixel': (1,),
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'StripOffsets': (8,),
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'Software': 'ImageMagick 6.5.7-8 2012-08-17 Q16 http://www.imagemagick.org'}
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# assert_equal is equivalent, 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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assert_equal(known[tag], value)
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for tag, value in known.items():
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assert_equal(value, named[tag])
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def test_write_metadata():
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""" Test metadata writing through the python code """
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img = Image.open('Tests/images/lena.tif')
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f = 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 = ['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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assert_equal(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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assert_equal(value, reloaded[tag], "%s didn't roundtrip" % tag)
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