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Merge pull request #2883 from uploadcare/tiff-wrong-bitspersample

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Fix count of BITSPERSAMPLE items in broken TIFF files
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wiredfool 2017-12-09 14:32:47 +00:00 committed by GitHub
commit 9ed4ea9e47
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3 changed files with 24 additions and 5 deletions
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21
PIL/TiffImagePlugin.py
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@ -1186,12 +1186,23 @@ class TiffImageFile(ImageFile.ImageFile):
# for more exotic images.
sampleFormat = (1,)
bps_tuple = self.tag_v2.get(BITSPERSAMPLE, (1,))
extra_tuple = self.tag_v2.get(EXTRASAMPLES, ())
if photo in (2, 6, 8): # RGB, YCbCr, LAB
bps_count = 3
elif photo == 5: # CMYK
bps_count = 4
else:
bps_count = 1
bps_count += len(extra_tuple)
# Some files have only one value in bps_tuple,
# while should have more. Fix it
if bps_count > len(bps_tuple) and len(bps_tuple) == 1:
bps_tuple = bps_tuple * bps_count
# mode: check photometric interpretation and bits per pixel
key = (
self.tag_v2.prefix, photo, sampleFormat, fillorder,
self.tag_v2.get(BITSPERSAMPLE, (1,)),
self.tag_v2.get(EXTRASAMPLES, ())
)
key = (self.tag_v2.prefix, photo, sampleFormat, fillorder,
bps_tuple, extra_tuple)
if DEBUG:
print("format key:", key)
try:

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Tests/images/tiff_wrong_bits_per_sample.tiff Normal file
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8
Tests/test_file_tiff.py
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@ -59,6 +59,14 @@ class TestFileTiff(PillowTestCase):
self.assertEqual(im.tile, [('tiff_lzw', (0, 0, 100, 40), 50, 'RGBa;16B')])
im.load()
def test_wrong_bits_per_sample(self):
im = Image.open("Tests/images/tiff_wrong_bits_per_sample.tiff")
self.assertEqual(im.mode, "RGBA")
self.assertEqual(im.size, (52, 53))
self.assertEqual(im.tile, [('raw', (0, 0, 52, 53), 160, ('RGBA', 0, 1))])
im.load()
def test_gimp_tiff(self):
# Read TIFF JPEG images from GIMP [@PIL168]