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367 lines
12 KiB
Python
367 lines
12 KiB
Python
from helper import unittest, PillowTestCase, hopper, py3
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import os
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from PIL import Image, TiffImagePlugin
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class LibTiffTestCase(PillowTestCase):
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def setUp(self):
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codecs = dir(Image.core)
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if "libtiff_encoder" not in codecs or "libtiff_decoder" not in codecs:
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self.skipTest("tiff support not available")
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def _assert_noerr(self, im):
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"""Helper tests that assert basic sanity about the g4 tiff reading"""
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# 1 bit
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self.assertEqual(im.mode, "1")
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# Does the data actually load
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im.load()
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im.getdata()
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try:
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self.assertEqual(im._compression, 'group4')
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except:
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print("No _compression")
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print (dir(im))
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# can we write it back out, in a different form.
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out = self.tempfile("temp.png")
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im.save(out)
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class TestFileLibTiff(LibTiffTestCase):
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def test_g4_tiff(self):
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"""Test the ordinary file path load path"""
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file = "Tests/images/hopper_g4_500.tif"
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im = Image.open(file)
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self.assertEqual(im.size, (500, 500))
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self._assert_noerr(im)
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def test_g4_large(self):
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file = "Tests/images/pport_g4.tif"
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im = Image.open(file)
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self._assert_noerr(im)
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def test_g4_tiff_file(self):
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"""Testing the string load path"""
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file = "Tests/images/hopper_g4_500.tif"
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with open(file, 'rb') as f:
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im = Image.open(f)
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self.assertEqual(im.size, (500, 500))
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self._assert_noerr(im)
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def test_g4_tiff_bytesio(self):
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"""Testing the stringio loading code path"""
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from io import BytesIO
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file = "Tests/images/hopper_g4_500.tif"
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s = BytesIO()
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with open(file, 'rb') as f:
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s.write(f.read())
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s.seek(0)
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im = Image.open(s)
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self.assertEqual(im.size, (500, 500))
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self._assert_noerr(im)
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def test_g4_eq_png(self):
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""" Checking that we're actually getting the data that we expect"""
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png = Image.open('Tests/images/hopper_bw_500.png')
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g4 = Image.open('Tests/images/hopper_g4_500.tif')
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self.assert_image_equal(g4, png)
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# see https://github.com/python-pillow/Pillow/issues/279
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def test_g4_fillorder_eq_png(self):
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""" Checking that we're actually getting the data that we expect"""
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png = Image.open('Tests/images/g4-fillorder-test.png')
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g4 = Image.open('Tests/images/g4-fillorder-test.tif')
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self.assert_image_equal(g4, png)
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def test_g4_write(self):
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"""Checking to see that the saved image is the same as what we wrote"""
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file = "Tests/images/hopper_g4_500.tif"
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orig = Image.open(file)
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out = self.tempfile("temp.tif")
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rot = orig.transpose(Image.ROTATE_90)
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self.assertEqual(rot.size, (500, 500))
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rot.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.size, (500, 500))
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self._assert_noerr(reread)
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self.assert_image_equal(reread, rot)
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self.assertEqual(reread.info['compression'], 'group4')
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self.assertEqual(reread.info['compression'], orig.info['compression'])
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self.assertNotEqual(orig.tobytes(), reread.tobytes())
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def test_adobe_deflate_tiff(self):
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file = "Tests/images/tiff_adobe_deflate.tif"
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im = Image.open(file)
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self.assertEqual(im.mode, "RGB")
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self.assertEqual(im.size, (278, 374))
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self.assertEqual(
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im.tile[0][:3], ('tiff_adobe_deflate', (0, 0, 278, 374), 0))
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im.load()
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def test_write_metadata(self):
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""" Test metadata writing through libtiff """
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img = Image.open('Tests/images/hopper_g4.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.named()
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reloaded = loaded.tag.named()
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# PhotometricInterpretation is set from SAVE_INFO,
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# not the original image.
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ignored = [
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'StripByteCounts', 'RowsPerStrip',
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'PageNumber', 'PhotometricInterpretation']
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for tag, value in reloaded.items():
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if tag not in ignored:
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if tag.endswith('Resolution'):
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val = original[tag]
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self.assert_almost_equal(
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val[0][0]/val[0][1], value[0][0]/value[0][1],
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msg="%s didn't roundtrip" % tag)
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else:
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self.assertEqual(
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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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if tag.endswith('Resolution'):
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val = reloaded[tag]
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self.assert_almost_equal(
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val[0][0]/val[0][1], value[0][0]/value[0][1],
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msg="%s didn't roundtrip" % tag)
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else:
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self.assertEqual(
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value, reloaded[tag], "%s didn't roundtrip" % tag)
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def test_g3_compression(self):
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i = Image.open('Tests/images/hopper_g4_500.tif')
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out = self.tempfile("temp.tif")
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i.save(out, compression='group3')
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reread = Image.open(out)
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self.assertEqual(reread.info['compression'], 'group3')
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self.assert_image_equal(reread, i)
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def test_little_endian(self):
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im = Image.open('Tests/images/16bit.deflate.tif')
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self.assertEqual(im.getpixel((0, 0)), 480)
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self.assertEqual(im.mode, 'I;16')
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b = im.tobytes()
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# Bytes are in image native order (little endian)
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if py3:
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self.assertEqual(b[0], ord(b'\xe0'))
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self.assertEqual(b[1], ord(b'\x01'))
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else:
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self.assertEqual(b[0], b'\xe0')
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self.assertEqual(b[1], b'\x01')
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out = self.tempfile("temp.tif")
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# out = "temp.le.tif"
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im.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.info['compression'], im.info['compression'])
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self.assertEqual(reread.getpixel((0, 0)), 480)
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# UNDONE - libtiff defaults to writing in native endian, so
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# on big endian, we'll get back mode = 'I;16B' here.
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def test_big_endian(self):
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im = Image.open('Tests/images/16bit.MM.deflate.tif')
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self.assertEqual(im.getpixel((0, 0)), 480)
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self.assertEqual(im.mode, 'I;16B')
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b = im.tobytes()
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# Bytes are in image native order (big endian)
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if py3:
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self.assertEqual(b[0], ord(b'\x01'))
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self.assertEqual(b[1], ord(b'\xe0'))
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else:
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self.assertEqual(b[0], b'\x01')
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self.assertEqual(b[1], b'\xe0')
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out = self.tempfile("temp.tif")
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im.save(out)
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reread = Image.open(out)
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self.assertEqual(reread.info['compression'], im.info['compression'])
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self.assertEqual(reread.getpixel((0, 0)), 480)
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def test_g4_string_info(self):
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"""Tests String data in info directory"""
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file = "Tests/images/hopper_g4_500.tif"
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orig = Image.open(file)
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out = self.tempfile("temp.tif")
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orig.tag[269] = 'temp.tif'
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orig.save(out)
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reread = Image.open(out)
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self.assertEqual('temp.tif', reread.tag[269])
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def test_12bit_rawmode(self):
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""" Are we generating the same interpretation
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of the image as Imagemagick is? """
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TiffImagePlugin.READ_LIBTIFF = True
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# Image.DEBUG = True
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im = Image.open('Tests/images/12bit.cropped.tif')
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im.load()
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TiffImagePlugin.READ_LIBTIFF = False
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# to make the target --
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# convert 12bit.cropped.tif -depth 16 tmp.tif
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# convert tmp.tif -evaluate RightShift 4 12in16bit2.tif
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# imagemagick will auto scale so that a 12bit FFF is 16bit FFF0,
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# so we need to unshift so that the integer values are the same.
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im2 = Image.open('Tests/images/12in16bit.tif')
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if Image.DEBUG:
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print (im.getpixel((0, 0)))
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print (im.getpixel((0, 1)))
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print (im.getpixel((0, 2)))
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print (im2.getpixel((0, 0)))
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print (im2.getpixel((0, 1)))
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print (im2.getpixel((0, 2)))
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self.assert_image_equal(im, im2)
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def test_blur(self):
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# test case from irc, how to do blur on b/w image
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# and save to compressed tif.
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from PIL import ImageFilter
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out = self.tempfile('temp.tif')
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im = Image.open('Tests/images/pport_g4.tif')
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im = im.convert('L')
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im = im.filter(ImageFilter.GaussianBlur(4))
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im.save(out, compression='tiff_adobe_deflate')
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im2 = Image.open(out)
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im2.load()
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self.assert_image_equal(im, im2)
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def test_compressions(self):
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im = hopper('RGB')
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out = self.tempfile('temp.tif')
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for compression in ('packbits', 'tiff_lzw'):
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im.save(out, compression=compression)
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im2 = Image.open(out)
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self.assert_image_equal(im, im2)
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im.save(out, compression='jpeg')
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im2 = Image.open(out)
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self.assert_image_similar(im, im2, 30)
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def test_cmyk_save(self):
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im = hopper('CMYK')
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out = self.tempfile('temp.tif')
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im.save(out, compression='tiff_adobe_deflate')
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im2 = Image.open(out)
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self.assert_image_equal(im, im2)
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def xtest_bw_compression_wRGB(self):
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""" This test passes, but when running all tests causes a failure due
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to output on stderr from the error thrown by libtiff. We need to
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capture that but not now"""
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im = hopper('RGB')
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out = self.tempfile('temp.tif')
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self.assertRaises(
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IOError, lambda: im.save(out, compression='tiff_ccitt'))
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self.assertRaises(IOError, lambda: im.save(out, compression='group3'))
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self.assertRaises(IOError, lambda: im.save(out, compression='group4'))
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def test_fp_leak(self):
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im = Image.open("Tests/images/hopper_g4_500.tif")
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fn = im.fp.fileno()
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os.fstat(fn)
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im.load() # this should close it.
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self.assertRaises(OSError, lambda: os.fstat(fn))
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im = None # this should force even more closed.
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self.assertRaises(OSError, lambda: os.fstat(fn))
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self.assertRaises(OSError, lambda: os.close(fn))
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def test_multipage(self):
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# issue #862
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TiffImagePlugin.READ_LIBTIFF = True
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im = Image.open('Tests/images/multipage.tiff')
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# file is a multipage tiff, 10x10 green, 10x10 red, 20x20 blue
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im.seek(0)
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self.assertEqual(im.size, (10,10))
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self.assertEqual(im.convert('RGB').getpixel((0,0)), (0,128,0))
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self.assertTrue(im.tag.next)
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im.seek(1)
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self.assertEqual(im.size, (10,10))
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self.assertEqual(im.convert('RGB').getpixel((0,0)), (255,0,0))
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self.assertTrue(im.tag.next)
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im.seek(2)
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self.assertFalse(im.tag.next)
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self.assertEqual(im.size, (20,20))
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self.assertEqual(im.convert('RGB').getpixel((0,0)), (0,0,255))
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TiffImagePlugin.READ_LIBTIFF = False
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def test__next(self):
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TiffImagePlugin.READ_LIBTIFF = True
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im = Image.open('Tests/images/hopper.tif')
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self.assertFalse(im.tag.next)
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im.load()
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self.assertFalse(im.tag.next)
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def test_4bit(self):
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# Arrange
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test_file = "Tests/images/hopper_gray_4bpp.tif"
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original = hopper("L")
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# Act
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TiffImagePlugin.READ_LIBTIFF = True
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im = Image.open(test_file)
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TiffImagePlugin.READ_LIBTIFF = False
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# Assert
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self.assertEqual(im.size, (128, 128))
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self.assertEqual(im.mode, "L")
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self.assert_image_similar(im, original, 7.3)
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if __name__ == '__main__':
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unittest.main()
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# End of file
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