from __future__ import division
from array import array
from PIL import Image, ImageFilter
from helper import unittest, PillowTestCase
try:
import numpy
except ImportError:
numpy = None
class TestColorLut3DCoreAPI(PillowTestCase):
def generate_identity_table(self, channels, size):
if isinstance(size, tuple):
size1D, size2D, size3D = size
else:
size1D, size2D, size3D = (size, size, size)
table = [
[
r / float(size1D-1) if size1D != 1 else 0,
g / float(size2D-1) if size2D != 1 else 0,
b / float(size3D-1) if size3D != 1 else 0,
r / float(size1D-1) if size1D != 1 else 0,
g / float(size2D-1) if size2D != 1 else 0,
][:channels]
for b in range(size3D)
for g in range(size2D)
for r in range(size1D)
]
return (
channels, size1D, size2D, size3D,
[item for sublist in table for item in sublist])
def test_wrong_args(self):
im = Image.new('RGB', (10, 10), 0)
with self.assertRaisesRegex(ValueError, "filter"):
im.im.color_lut_3d('RGB', Image.CUBIC,
*self.generate_identity_table(3, 3))
with self.assertRaisesRegex(ValueError, "image mode"):
im.im.color_lut_3d('wrong', Image.LINEAR,
*self.generate_identity_table(3, 3))
with self.assertRaisesRegex(ValueError, "table_channels"):
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(5, 3))
with self.assertRaisesRegex(ValueError, "table_channels"):
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(1, 3))
with self.assertRaisesRegex(ValueError, "table_channels"):
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(2, 3))
with self.assertRaisesRegex(ValueError, "Table size"):
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, (1, 3, 3)))
with self.assertRaisesRegex(ValueError, "Table size"):
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, (66, 3, 3)))
with self.assertRaisesRegex(ValueError, r"size1D \* size2D \* size3D"):
im.im.color_lut_3d('RGB', Image.LINEAR,
3, 2, 2, 2, [0, 0, 0] * 7)
with self.assertRaisesRegex(ValueError, r"size1D \* size2D \* size3D"):
im.im.color_lut_3d('RGB', Image.LINEAR,
3, 2, 2, 2, [0, 0, 0] * 9)
with self.assertRaises(TypeError):
im.im.color_lut_3d('RGB', Image.LINEAR,
3, 2, 2, 2, [0, 0, "0"] * 8)
with self.assertRaises(TypeError):
im.im.color_lut_3d('RGB', Image.LINEAR,
3, 2, 2, 2, 16)
def test_correct_args(self):
im = Image.new('RGB', (10, 10), 0)
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, 3))
im.im.color_lut_3d('CMYK', Image.LINEAR,
*self.generate_identity_table(4, 3))
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, (2, 3, 3)))
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, (65, 3, 3)))
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, (3, 65, 3)))
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, (3, 3, 65)))
def test_wrong_mode(self):
with self.assertRaisesRegex(ValueError, "wrong mode"):
im = Image.new('L', (10, 10), 0)
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, 3))
with self.assertRaisesRegex(ValueError, "wrong mode"):
im = Image.new('RGB', (10, 10), 0)
im.im.color_lut_3d('L', Image.LINEAR,
*self.generate_identity_table(3, 3))
with self.assertRaisesRegex(ValueError, "wrong mode"):
im = Image.new('L', (10, 10), 0)
im.im.color_lut_3d('L', Image.LINEAR,
*self.generate_identity_table(3, 3))
with self.assertRaisesRegex(ValueError, "wrong mode"):
im = Image.new('RGB', (10, 10), 0)
im.im.color_lut_3d('RGBA', Image.LINEAR,
*self.generate_identity_table(3, 3))
with self.assertRaisesRegex(ValueError, "wrong mode"):
im = Image.new('RGB', (10, 10), 0)
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(4, 3))
def test_correct_mode(self):
im = Image.new('RGBA', (10, 10), 0)
im.im.color_lut_3d('RGBA', Image.LINEAR,
*self.generate_identity_table(3, 3))
im = Image.new('RGBA', (10, 10), 0)
im.im.color_lut_3d('RGBA', Image.LINEAR,
*self.generate_identity_table(4, 3))
im = Image.new('RGB', (10, 10), 0)
im.im.color_lut_3d('HSV', Image.LINEAR,
*self.generate_identity_table(3, 3))
im = Image.new('RGB', (10, 10), 0)
im.im.color_lut_3d('RGBA', Image.LINEAR,
*self.generate_identity_table(4, 3))
def test_identities(self):
g = Image.linear_gradient('L')
im = Image.merge('RGB', [g, g.transpose(Image.ROTATE_90),
g.transpose(Image.ROTATE_180)])
# Fast test with small cubes
for size in [2, 3, 5, 7, 11, 16, 17]:
self.assert_image_equal(im, im._new(
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, size))))
# Not so fast
self.assert_image_equal(im, im._new(
im.im.color_lut_3d('RGB', Image.LINEAR,
*self.generate_identity_table(3, (2, 2, 65)))))
def test_identities_4_channels(self):
g = Image.linear_gradient('L')
im = Image.merge('RGB', [g, g.transpose(Image.ROTATE_90),
g.transpose(Image.ROTATE_180)])
# Red channel copied to alpha
self.assert_image_equal(
Image.merge('RGBA', (im.split()*2)[:4]),
im._new(im.im.color_lut_3d('RGBA', Image.LINEAR,
*self.generate_identity_table(4, 17))))
def test_copy_alpha_channel(self):
g = Image.linear_gradient('L')
im = Image.merge('RGBA', [g, g.transpose(Image.ROTATE_90),
g.transpose(Image.ROTATE_180),
g.transpose(Image.ROTATE_270)])
self.assert_image_equal(im, im._new(
im.im.color_lut_3d('RGBA', Image.LINEAR,
*self.generate_identity_table(3, 17))))
def test_channels_order(self):
g = Image.linear_gradient('L')
im = Image.merge('RGB', [g, g.transpose(Image.ROTATE_90),
g.transpose(Image.ROTATE_180)])
# Reverse channels by splitting and using table
self.assert_image_equal(
Image.merge('RGB', im.split()[::-1]),
im._new(im.im.color_lut_3d('RGB', Image.LINEAR,
3, 2, 2, 2, [
0, 0, 0, 0, 0, 1,
0, 1, 0, 0, 1, 1,
1, 0, 0, 1, 0, 1,
1, 1, 0, 1, 1, 1,
])))
def test_overflow(self):
g = Image.linear_gradient('L')
im = Image.merge('RGB', [g, g.transpose(Image.ROTATE_90),
g.transpose(Image.ROTATE_180)])
transformed = im._new(im.im.color_lut_3d('RGB', Image.LINEAR,
3, 2, 2, 2,
[
-1, -1, -1, 2, -1, -1,
-1, 2, -1, 2, 2, -1,
-1, -1, 2, 2, -1, 2,
-1, 2, 2, 2, 2, 2,
])).load()
self.assertEqual(transformed[0, 0], (0, 0, 255))
self.assertEqual(transformed[50, 50], (0, 0, 255))
self.assertEqual(transformed[255, 0], (0, 255, 255))
self.assertEqual(transformed[205, 50], (0, 255, 255))
self.assertEqual(transformed[0, 255], (255, 0, 0))
self.assertEqual(transformed[50, 205], (255, 0, 0))
self.assertEqual(transformed[255, 255], (255, 255, 0))
self.assertEqual(transformed[205, 205], (255, 255, 0))
transformed = im._new(im.im.color_lut_3d('RGB', Image.LINEAR,
3, 2, 2, 2,
[
-3, -3, -3, 5, -3, -3,
-3, 5, -3, 5, 5, -3,
-3, -3, 5, 5, -3, 5,
-3, 5, 5, 5, 5, 5,
])).load()
self.assertEqual(transformed[0, 0], (0, 0, 255))
self.assertEqual(transformed[50, 50], (0, 0, 255))
self.assertEqual(transformed[255, 0], (0, 255, 255))
self.assertEqual(transformed[205, 50], (0, 255, 255))
self.assertEqual(transformed[0, 255], (255, 0, 0))
self.assertEqual(transformed[50, 205], (255, 0, 0))
self.assertEqual(transformed[255, 255], (255, 255, 0))
self.assertEqual(transformed[205, 205], (255, 255, 0))
class TestColorLut3DFilter(PillowTestCase):
def test_wrong_args(self):
with self.assertRaisesRegex(ValueError, "should be either an integer"):
ImageFilter.Color3DLUT("small", [1])
with self.assertRaisesRegex(ValueError, "should be either an integer"):
ImageFilter.Color3DLUT((11, 11), [1])
with self.assertRaisesRegex(ValueError, r"in \[2, 65\] range"):
ImageFilter.Color3DLUT((11, 11, 1), [1])
with self.assertRaisesRegex(ValueError, r"in \[2, 65\] range"):
ImageFilter.Color3DLUT((11, 11, 66), [1])
with self.assertRaisesRegex(ValueError, "table should have .+ items"):
ImageFilter.Color3DLUT((3, 3, 3), [1, 1, 1])
with self.assertRaisesRegex(ValueError, "table should have .+ items"):
ImageFilter.Color3DLUT((3, 3, 3), [[1, 1, 1]] * 2)
with self.assertRaisesRegex(ValueError, "should have a length of 4"):
ImageFilter.Color3DLUT((3, 3, 3), [[1, 1, 1]] * 27, channels=4)
with self.assertRaisesRegex(ValueError, "should have a length of 3"):
ImageFilter.Color3DLUT((2, 2, 2), [[1, 1]] * 8)
with self.assertRaisesRegex(ValueError, "Only 3 or 4 output"):
ImageFilter.Color3DLUT((2, 2, 2), [[1, 1]] * 8, channels=2)
def test_convert_table(self):
lut = ImageFilter.Color3DLUT(2, [0, 1, 2] * 8)
self.assertEqual(tuple(lut.size), (2, 2, 2))
self.assertEqual(lut.name, "Color 3D LUT")
lut = ImageFilter.Color3DLUT((2, 2, 2), [
(0, 1, 2), (3, 4, 5), (6, 7, 8), (9, 10, 11),
(12, 13, 14), (15, 16, 17), (18, 19, 20), (21, 22, 23)])
self.assertEqual(tuple(lut.size), (2, 2, 2))
self.assertEqual(lut.table, list(range(24)))
lut = ImageFilter.Color3DLUT((2, 2, 2), [(0, 1, 2, 3)] * 8,
channels=4)
@unittest.skipIf(numpy is None, "Numpy is not installed")
def test_numpy_sources(self):
table = numpy.ones((5, 6, 7, 3), dtype=numpy.float16)
with self.assertRaisesRegex(ValueError, "should have either channels"):
lut = ImageFilter.Color3DLUT((5, 6, 7), table)
table = numpy.ones((7, 6, 5, 3), dtype=numpy.float16)
lut = ImageFilter.Color3DLUT((5, 6, 7), table)
self.assertIsInstance(lut.table, numpy.ndarray)
self.assertEqual(lut.table.dtype, table.dtype)
self.assertEqual(lut.table.shape, (table.size,))
table = numpy.ones((7 * 6 * 5, 3), dtype=numpy.float16)
lut = ImageFilter.Color3DLUT((5, 6, 7), table)
self.assertEqual(lut.table.shape, (table.size,))
table = numpy.ones((7 * 6 * 5 * 3), dtype=numpy.float16)
lut = ImageFilter.Color3DLUT((5, 6, 7), table)
self.assertEqual(lut.table.shape, (table.size,))
# Check application
Image.new('RGB', (10, 10), 0).filter(lut)
# Check copy
table[0] = 33
self.assertEqual(lut.table[0], 1)
# Check not copy
table = numpy.ones((7 * 6 * 5 * 3), dtype=numpy.float16)
lut = ImageFilter.Color3DLUT((5, 6, 7), table, _copy_table=False)
table[0] = 33
self.assertEqual(lut.table[0], 33)
@unittest.skipIf(numpy is None, "Numpy is not installed")
def test_numpy_formats(self):
g = Image.linear_gradient('L')
im = Image.merge('RGB', [g, g.transpose(Image.ROTATE_90),
g.transpose(Image.ROTATE_180)])
lut = ImageFilter.Color3DLUT.generate((7, 9, 11),
lambda r, g, b: (r, g, b))
lut.table = numpy.array(lut.table, dtype=numpy.float32)[:-1]
with self.assertRaisesRegex(ValueError, "should have table_channels"):
im.filter(lut)
lut = ImageFilter.Color3DLUT.generate((7, 9, 11),
lambda r, g, b: (r, g, b))
lut.table = (numpy.array(lut.table, dtype=numpy.float32)
.reshape((7 * 9 * 11), 3))
with self.assertRaisesRegex(ValueError, "should have table_channels"):
im.filter(lut)
lut = ImageFilter.Color3DLUT.generate((7, 9, 11),
lambda r, g, b: (r, g, b))
lut.table = numpy.array(lut.table, dtype=numpy.float16)
self.assert_image_equal(im, im.filter(lut))
lut = ImageFilter.Color3DLUT.generate((7, 9, 11),
lambda r, g, b: (r, g, b))
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