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Pillow/Tests/test_file_jpeg.py
Andrew Murray 2a3a34d2ff Treat MPO with unknown header as base JPEG file
2015-07-19 22:56:04 +10:00

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from helper import unittest, PillowTestCase, hopper, py3
from helper import djpeg_available, cjpeg_available
import random
from io import BytesIO
import os
from PIL import Image
from PIL import ImageFile
from PIL import JpegImagePlugin
codecs = dir(Image.core)
TEST_FILE = "Tests/images/hopper.jpg"
class TestFileJpeg(PillowTestCase):
def setUp(self):
if "jpeg_encoder" not in codecs or "jpeg_decoder" not in codecs:
self.skipTest("jpeg support not available")
def roundtrip(self, im, **options):
out = BytesIO()
im.save(out, "JPEG", **options)
test_bytes = out.tell()
out.seek(0)
im = Image.open(out)
im.bytes = test_bytes # for testing only
return im
def test_sanity(self):
# internal version number
self.assertRegexpMatches(Image.core.jpeglib_version, "\d+\.\d+$")
im = Image.open(TEST_FILE)
im.load()
self.assertEqual(im.mode, "RGB")
self.assertEqual(im.size, (128, 128))
self.assertEqual(im.format, "JPEG")
def test_app(self):
# Test APP/COM reader (@PIL135)
im = Image.open(TEST_FILE)
self.assertEqual(
im.applist[0],
("APP0", b"JFIF\x00\x01\x01\x01\x00`\x00`\x00\x00"))
self.assertEqual(im.applist[1], (
"COM", b"File written by Adobe Photoshop\xa8 4.0\x00"))
self.assertEqual(len(im.applist), 2)
def test_cmyk(self):
# Test CMYK handling. Thanks to Tim and Charlie for test data,
# Michael for getting me to look one more time.
f = "Tests/images/pil_sample_cmyk.jpg"
im = Image.open(f)
# the source image has red pixels in the upper left corner.
c, m, y, k = [x / 255.0 for x in im.getpixel((0, 0))]
self.assertEqual(c, 0.0)
self.assertGreater(m, 0.8)
self.assertGreater(y, 0.8)
self.assertEqual(k, 0.0)
# the opposite corner is black
c, m, y, k = [x / 255.0 for x in im.getpixel((
im.size[0]-1, im.size[1]-1))]
self.assertGreater(k, 0.9)
# roundtrip, and check again
im = self.roundtrip(im)
c, m, y, k = [x / 255.0 for x in im.getpixel((0, 0))]
self.assertEqual(c, 0.0)
self.assertGreater(m, 0.8)
self.assertGreater(y, 0.8)
self.assertEqual(k, 0.0)
c, m, y, k = [x / 255.0 for x in im.getpixel((
im.size[0]-1, im.size[1]-1))]
self.assertGreater(k, 0.9)
def test_dpi(self):
def test(xdpi, ydpi=None):
im = Image.open(TEST_FILE)
im = self.roundtrip(im, dpi=(xdpi, ydpi or xdpi))
return im.info.get("dpi")
self.assertEqual(test(72), (72, 72))
self.assertEqual(test(300), (300, 300))
self.assertEqual(test(100, 200), (100, 200))
self.assertEqual(test(0), None) # square pixels
def test_icc(self):
# Test ICC support
im1 = Image.open("Tests/images/rgb.jpg")
icc_profile = im1.info["icc_profile"]
self.assertEqual(len(icc_profile), 3144)
# Roundtrip via physical file.
f = self.tempfile("temp.jpg")
im1.save(f, icc_profile=icc_profile)
im2 = Image.open(f)
self.assertEqual(im2.info.get("icc_profile"), icc_profile)
# Roundtrip via memory buffer.
im1 = self.roundtrip(hopper())
im2 = self.roundtrip(hopper(), icc_profile=icc_profile)
self.assert_image_equal(im1, im2)
self.assertFalse(im1.info.get("icc_profile"))
self.assertTrue(im2.info.get("icc_profile"))
def test_icc_big(self):
# Make sure that the "extra" support handles large blocks
def test(n):
# The ICC APP marker can store 65519 bytes per marker, so
# using a 4-byte test code should allow us to detect out of
# order issues.
icc_profile = (b"Test"*int(n/4+1))[:n]
assert len(icc_profile) == n # sanity
im1 = self.roundtrip(hopper(), icc_profile=icc_profile)
self.assertEqual(im1.info.get("icc_profile"), icc_profile or None)
test(0)
test(1)
test(3)
test(4)
test(5)
test(65533-14) # full JPEG marker block
test(65533-14+1) # full block plus one byte
test(ImageFile.MAXBLOCK) # full buffer block
test(ImageFile.MAXBLOCK+1) # full buffer block plus one byte
test(ImageFile.MAXBLOCK*4+3) # large block
def test_optimize(self):
im1 = self.roundtrip(hopper())
im2 = self.roundtrip(hopper(), optimize=1)
self.assert_image_equal(im1, im2)
self.assertGreaterEqual(im1.bytes, im2.bytes)
def test_optimize_large_buffer(self):
# https://github.com/python-pillow/Pillow/issues/148
f = self.tempfile('temp.jpg')
# this requires ~ 1.5x Image.MAXBLOCK
im = Image.new("RGB", (4096, 4096), 0xff3333)
im.save(f, format="JPEG", optimize=True)
def test_progressive(self):
im1 = self.roundtrip(hopper())
im2 = self.roundtrip(hopper(), progressive=True)
self.assert_image_equal(im1, im2)
self.assertGreaterEqual(im1.bytes, im2.bytes)
def test_progressive_large_buffer(self):
f = self.tempfile('temp.jpg')
# this requires ~ 1.5x Image.MAXBLOCK
im = Image.new("RGB", (4096, 4096), 0xff3333)
im.save(f, format="JPEG", progressive=True)
def test_progressive_large_buffer_highest_quality(self):
f = self.tempfile('temp.jpg')
if py3:
a = bytes(random.randint(0, 255) for _ in range(256 * 256 * 3))
else:
a = b''.join(chr(random.randint(0, 255)) for _ in range(
256 * 256 * 3))
im = Image.frombuffer("RGB", (256, 256), a, "raw", "RGB", 0, 1)
# this requires more bytes than pixels in the image
im.save(f, format="JPEG", progressive=True, quality=100)
def test_large_exif(self):
# https://github.com/python-pillow/Pillow/issues/148
f = self.tempfile('temp.jpg')
im = hopper()
im.save(f, 'JPEG', quality=90, exif=b"1"*65532)
def test_progressive_compat(self):
im1 = self.roundtrip(hopper())
im2 = self.roundtrip(hopper(), progressive=1)
im3 = self.roundtrip(hopper(), progression=1) # compatibility
self.assert_image_equal(im1, im2)
self.assert_image_equal(im1, im3)
self.assertFalse(im1.info.get("progressive"))
self.assertFalse(im1.info.get("progression"))
self.assertTrue(im2.info.get("progressive"))
self.assertTrue(im2.info.get("progression"))
self.assertTrue(im3.info.get("progressive"))
self.assertTrue(im3.info.get("progression"))
def test_quality(self):
im1 = self.roundtrip(hopper())
im2 = self.roundtrip(hopper(), quality=50)
self.assert_image(im1, im2.mode, im2.size)
self.assertGreaterEqual(im1.bytes, im2.bytes)
def test_smooth(self):
im1 = self.roundtrip(hopper())
im2 = self.roundtrip(hopper(), smooth=100)
self.assert_image(im1, im2.mode, im2.size)
def test_subsampling(self):
def getsampling(im):
layer = im.layer
return layer[0][1:3] + layer[1][1:3] + layer[2][1:3]
# experimental API
im = self.roundtrip(hopper(), subsampling=-1) # default
self.assertEqual(getsampling(im), (2, 2, 1, 1, 1, 1))
im = self.roundtrip(hopper(), subsampling=0) # 4:4:4
self.assertEqual(getsampling(im), (1, 1, 1, 1, 1, 1))
im = self.roundtrip(hopper(), subsampling=1) # 4:2:2
self.assertEqual(getsampling(im), (2, 1, 1, 1, 1, 1))
im = self.roundtrip(hopper(), subsampling=2) # 4:1:1
self.assertEqual(getsampling(im), (2, 2, 1, 1, 1, 1))
im = self.roundtrip(hopper(), subsampling=3) # default (undefined)
self.assertEqual(getsampling(im), (2, 2, 1, 1, 1, 1))
im = self.roundtrip(hopper(), subsampling="4:4:4")
self.assertEqual(getsampling(im), (1, 1, 1, 1, 1, 1))
im = self.roundtrip(hopper(), subsampling="4:2:2")
self.assertEqual(getsampling(im), (2, 1, 1, 1, 1, 1))
im = self.roundtrip(hopper(), subsampling="4:1:1")
self.assertEqual(getsampling(im), (2, 2, 1, 1, 1, 1))
self.assertRaises(
TypeError, lambda: self.roundtrip(hopper(), subsampling="1:1:1"))
def test_exif(self):
im = Image.open("Tests/images/pil_sample_rgb.jpg")
info = im._getexif()
self.assertEqual(info[305], 'Adobe Photoshop CS Macintosh')
def test_mp(self):
im = Image.open("Tests/images/pil_sample_rgb.jpg")
self.assertIsNone(im._getmp())
def test_quality_keep(self):
# RGB
im = Image.open("Tests/images/hopper.jpg")
f = self.tempfile('temp.jpg')
im.save(f, quality='keep')
# Grayscale
im = Image.open("Tests/images/hopper_gray.jpg")
f = self.tempfile('temp.jpg')
im.save(f, quality='keep')
# CMYK
im = Image.open("Tests/images/pil_sample_cmyk.jpg")
f = self.tempfile('temp.jpg')
im.save(f, quality='keep')
def test_junk_jpeg_header(self):
# https://github.com/python-pillow/Pillow/issues/630
filename = "Tests/images/junk_jpeg_header.jpg"
Image.open(filename)
def test_qtables(self):
im = Image.open("Tests/images/hopper.jpg")
qtables = im.quantization
reloaded = self.roundtrip(im, qtables=qtables, subsampling=0)
self.assertEqual(im.quantization, reloaded.quantization)
self.assert_image_similar(im, self.roundtrip(im, qtables='web_low'),
30)
self.assert_image_similar(im, self.roundtrip(im, qtables='web_high'),
30)
self.assert_image_similar(im, self.roundtrip(im, qtables='keep'), 30)
# values from wizard.txt in jpeg9-a src package.
standard_l_qtable = [int(s) for s in """
16 11 10 16 24 40 51 61
12 12 14 19 26 58 60 55
14 13 16 24 40 57 69 56
14 17 22 29 51 87 80 62
18 22 37 56 68 109 103 77
24 35 55 64 81 104 113 92
49 64 78 87 103 121 120 101
72 92 95 98 112 100 103 99
""".split(None)]
standard_chrominance_qtable = [int(s) for s in """
17 18 24 47 99 99 99 99
18 21 26 66 99 99 99 99
24 26 56 99 99 99 99 99
47 66 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
99 99 99 99 99 99 99 99
""".split(None)]
# list of qtable lists
self.assert_image_similar(
im, self.roundtrip(
im, qtables=[standard_l_qtable, standard_chrominance_qtable]),
30)
# tuple of qtable lists
self.assert_image_similar(
im, self.roundtrip(
im, qtables=(standard_l_qtable, standard_chrominance_qtable)),
30)
# dict of qtable lists
self.assert_image_similar(im,
self.roundtrip(im, qtables={
0: standard_l_qtable,
1: standard_chrominance_qtable
}), 30)
# not a sequence
self.assertRaises(Exception, lambda: self.roundtrip(im, qtables='a'))
# sequence wrong length
self.assertRaises(Exception, lambda: self.roundtrip(im, qtables=[]))
# sequence wrong length
self.assertRaises(Exception,
lambda: self.roundtrip(im, qtables=[1, 2, 3, 4, 5]))
# qtable entry not a sequence
self.assertRaises(Exception, lambda: self.roundtrip(im, qtables=[1]))
# qtable entry has wrong number of items
self.assertRaises(Exception,
lambda: self.roundtrip(im, qtables=[[1, 2, 3, 4]]))
@unittest.skipUnless(djpeg_available(), "djpeg not available")
def test_load_djpeg(self):
img = Image.open(TEST_FILE)
img.load_djpeg()
self.assert_image_similar(img, Image.open(TEST_FILE), 0)
@unittest.skipUnless(cjpeg_available(), "cjpeg not available")
def test_save_cjpeg(self):
img = Image.open(TEST_FILE)
tempfile = self.tempfile("temp.jpg")
JpegImagePlugin._save_cjpeg(img, 0, tempfile)
# Default save quality is 75%, so a tiny bit of difference is alright
self.assert_image_similar(img, Image.open(tempfile), 17)
def test_no_duplicate_0x1001_tag(self):
# Arrange
from PIL import ExifTags
tag_ids = dict(zip(ExifTags.TAGS.values(), ExifTags.TAGS.keys()))
# Assert
self.assertEqual(tag_ids['RelatedImageWidth'], 0x1001)
self.assertEqual(tag_ids['RelatedImageLength'], 0x1002)
def test_MAXBLOCK_scaling(self):
def gen_random_image(size):
""" Generates a very hard to compress file
:param size: tuple
"""
return Image.frombytes('RGB',
size, os.urandom(size[0]*size[1] * 3))
im = gen_random_image((512, 512))
f = self.tempfile("temp.jpeg")
im.save(f, quality=100, optimize=True)
reloaded = Image.open(f)
# none of these should crash
reloaded.save(f, quality='keep')
reloaded.save(f, quality='keep', progressive=True)
reloaded.save(f, quality='keep', optimize=True)
def test_bad_mpo_header(self):
""" Treat unknown MPO as JPEG """
# Arrange
# Act
# Shouldn't raise error
im = Image.open("Tests/images/sugarshack_bad_mpo_header.jpg")
# Assert
self.assertEqual(im.format, "JPEG")
if __name__ == '__main__':
unittest.main()
# End of file
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