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libtiff's rational precision is limited to C floats.

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Antony Lee 2015-06-30 18:29:29 -07:00 committed by wiredfool
parent ba7b8d1708
commit c113e8f7cd
1 changed files with 16 additions and 2 deletions
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18
Tests/test_file_libtiff.py
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@ -1,6 +1,7 @@
from __future__ import print_function from __future__ import print_function
from helper import unittest, PillowTestCase, hopper, py3 from helper import unittest, PillowTestCase, hopper, py3
from ctypes import c_float
import io import io
<<<<<<< HEAD <<<<<<< HEAD
import logging import logging
@ -144,10 +145,23 @@ class TestFileLibTiff(LibTiffTestCase):
loaded.tag.legacy_api = legacy_api loaded.tag.legacy_api = legacy_api
reloaded = loaded.tag.named() reloaded = loaded.tag.named()
for tag, value in itertools.chain(reloaded.items(), original.items()): for tag, value in itertools.chain(reloaded.items(),
original.items()):
if tag not in ignored: if tag not in ignored:
val = original[tag] val = original[tag]
self.assertEqual(val, value, msg="%s didn't roundtrip" % tag) if tag.endswith('Resolution'):
if legacy_api:
self.assertEqual(
c_float(val[0][0] / val[0][1]).value,
c_float(value[0][0] / value[0][1]).value,
msg="%s didn't roundtrip" % tag)
else:
self.assertEqual(
c_float(val).value, c_float(value).value,
msg="%s didn't roundtrip" % tag)
else:
self.assertEqual(
val, value, msg="%s didn't roundtrip" % tag)
def test_g3_compression(self): def test_g3_compression(self):
i = Image.open('Tests/images/hopper_g4_500.tif') i = Image.open('Tests/images/hopper_g4_500.tif')