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