242 lines
9.4 KiB
Python
Executable File
242 lines
9.4 KiB
Python
Executable File
#!/usr/bin/python
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import unittest
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import math
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#import logging
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#logging.basicConfig(level = logging.DEBUG)
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from gi.repository import Vips
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unsigned_formats = [Vips.BandFormat.UCHAR,
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Vips.BandFormat.USHORT,
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Vips.BandFormat.UINT]
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signed_formats = [Vips.BandFormat.CHAR,
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Vips.BandFormat.SHORT,
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Vips.BandFormat.INT]
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float_formats = [Vips.BandFormat.FLOAT,
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Vips.BandFormat.DOUBLE]
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complex_formats = [Vips.BandFormat.COMPLEX,
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Vips.BandFormat.DPCOMPLEX]
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int_formats = unsigned_formats + signed_formats
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noncomplex_formats = int_formats + float_formats
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all_formats = int_formats + float_formats + complex_formats
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colour_colourspaces = [Vips.Interpretation.XYZ,
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Vips.Interpretation.LAB,
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Vips.Interpretation.LCH,
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Vips.Interpretation.CMC,
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Vips.Interpretation.LABS,
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Vips.Interpretation.SCRGB,
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Vips.Interpretation.SRGB,
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Vips.Interpretation.RGB16,
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Vips.Interpretation.YXY]
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coded_colourspaces = [Vips.Interpretation.LABQ]
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mono_colourspaces = [Vips.Interpretation.GREY16,
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Vips.Interpretation.B_W]
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all_colourspaces = colour_colourspaces + mono_colourspaces + coded_colourspaces
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# an expanding zip ... if either of the args is not a list, duplicate it down
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# the other
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def zip_expand(x, y):
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if isinstance(x, list) and isinstance(y, list):
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return zip(x, y)
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elif isinstance(x, list):
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return [[i, y] for i in x]
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elif isinstance(y, list):
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return [[x, j] for j in y]
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else:
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return [[x, y]]
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# run a 1-ary function on a thing -- loop over elements if the
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# thing is a list
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def run_fn(fn, x):
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if isinstance(x, list):
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return [fn(i) for i in x]
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else:
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return fn(x)
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# run a 2-ary function on two things -- loop over elements pairwise if the
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# things are lists
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def run_fn2(fn, x, y):
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if isinstance(x, Vips.Image) or isinstance(y, Vips.Image):
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return fn(x, y)
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elif isinstance(x, list) or isinstance(y, list):
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return [fn(i, j) for i, j in zip_expand(x, y)]
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else:
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return fn(x, y)
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class TestColour(unittest.TestCase):
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# test a pair of things which can be lists for approx. equality
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def assertAlmostEqualObjects(self, a, b, places = 4, msg = ''):
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#print 'assertAlmostEqualObjects %s = %s' % (a, b)
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for x, y in zip_expand(a, b):
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self.assertAlmostEqual(x, y, places = places, msg = msg)
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# run a function on an image and on a single pixel, the results
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# should match
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def run_cmp(self, message, im, x, y, fn):
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a = im.getpoint(x, y)
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v1 = fn(a)
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im2 = fn(im)
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v2 = im2.getpoint(x, y)
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self.assertAlmostEqualObjects(v1, v2, msg = message)
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# run a function on a pair of images and on a pair of pixels, the results
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# should match
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def run_cmp2(self, message, left, right, x, y, fn):
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a = left.getpoint(x, y)
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b = right.getpoint(x, y)
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v1 = fn(a, b)
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after = fn(left, right)
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v2 = after.getpoint(x, y)
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self.assertAlmostEqualObjects(v1, v2, msg = message)
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# run a function on a pair of images
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# 50,50 and 10,10 should have different values on the test image
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def run_test2(self, message, left, right, fn):
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self.run_cmp2(message, left, right, 50, 50,
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lambda x, y: run_fn2(fn, x, y))
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self.run_cmp2(message, left, right, 10, 10,
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lambda x, y: run_fn2(fn, x, y))
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def setUp(self):
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im = Vips.Image.mask_ideal(100, 100, 0.5, reject = True, optical = True)
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self.colour = im * [1, 2, 3] + [2, 3, 4]
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self.mono = self.colour.extract_band(1)
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self.all_images = [self.mono, self.colour]
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def test_colourspace(self):
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# mid-grey in Lab ... put 42 in the extra band, it should be copied
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# unmodified
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test = Vips.Image.black(100, 100) + [50, 0, 0, 42]
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test = test.copy(interpretation = Vips.Interpretation.LAB)
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# a long series should come in a circle
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im = test
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for col in colour_colourspaces + [Vips.Interpretation.LAB]:
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im = im.colourspace(col)
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self.assertEqual(im.interpretation, col)
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pixel = im.getpoint(10, 10)
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self.assertAlmostEqual(pixel[3], 42, places = 2)
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before = test.getpoint(10, 10)
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after = im.getpoint(10, 10)
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self.assertAlmostEqualObjects(before, after, places = 1)
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# go between every pair of colour spaces
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for start in colour_colourspaces:
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for end in colour_colourspaces:
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im = test.colourspace(start)
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im2 = im.colourspace(end)
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im3 = im2.colourspace(Vips.Interpretation.LAB)
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before = test.getpoint(10, 10)
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after = im3.getpoint(10, 10)
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self.assertAlmostEqualObjects(before, after, places = 1)
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# test Lab->XYZ on mid-grey
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# checked against http://www.brucelindbloom.com
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im = test.colourspace(Vips.Interpretation.XYZ)
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after = im.getpoint(10, 10)
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self.assertAlmostEqualObjects(after, [17.5064, 18.4187, 20.0547, 42])
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# grey->colour->grey should be equal
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for mono_fmt in mono_colourspaces:
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test_grey = test.colourspace(mono_fmt)
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im = test_grey
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for col in colour_colourspaces + [mono_fmt]:
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im = im.colourspace(col)
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self.assertEqual(im.interpretation, col)
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[before, alpha_before] = test_grey.getpoint(10, 10)
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[after, alpha_after] = im.getpoint(10, 10)
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self.assertLess(abs(alpha_after - alpha_before), 1)
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if mono_fmt == Vips.Interpretation.GREY16:
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# GREY16 can wind up rather different due to rounding
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self.assertLess(abs(after - before), 30)
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else:
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# but 8-bit we should hit exactly
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self.assertLess(abs(after - before), 1)
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# test results from Bruce Lindbloom's calculator:
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# http://www.brucelindbloom.com
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def test_dE00(self):
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# put 42 in the extra band, it should be copied unmodified
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reference = Vips.Image.black(100, 100) + [50, 10, 20, 42]
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reference = reference.copy(interpretation = Vips.Interpretation.LAB)
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sample = Vips.Image.black(100, 100) + [40, -20, 10]
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sample = sample.copy(interpretation = Vips.Interpretation.LAB)
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difference = reference.dE00(sample)
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result, alpha = difference.getpoint(10, 10)
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self.assertAlmostEqual(result, 30.238, places = 3)
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self.assertAlmostEqual(alpha, 42.0, places = 3)
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def test_dE76(self):
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# put 42 in the extra band, it should be copied unmodified
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reference = Vips.Image.black(100, 100) + [50, 10, 20, 42]
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reference = reference.copy(interpretation = Vips.Interpretation.LAB)
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sample = Vips.Image.black(100, 100) + [40, -20, 10]
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sample = sample.copy(interpretation = Vips.Interpretation.LAB)
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difference = reference.dE76(sample)
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result, alpha = difference.getpoint(10, 10)
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self.assertAlmostEqual(result, 33.166, places = 3)
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self.assertAlmostEqual(alpha, 42.0, places = 3)
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# the vips CMC calculation is based on distance in a colorspace derived from
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# the CMC formula, so it won't match exactly ... see vips_LCh2CMC() for
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# details
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def test_dECMC(self):
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reference = Vips.Image.black(100, 100) + [50, 10, 20, 42]
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reference = reference.copy(interpretation = Vips.Interpretation.LAB)
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sample = Vips.Image.black(100, 100) + [55, 11, 23]
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sample = sample.copy(interpretation = Vips.Interpretation.LAB)
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difference = reference.dECMC(sample)
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result, alpha = difference.getpoint(10, 10)
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self.assertLess(abs(result - 4.97), 0.5)
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self.assertAlmostEqual(alpha, 42.0, places = 3)
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def test_icc(self):
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test = Vips.Image.new_from_file("images/IMG_4618.jpg")
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im = test.icc_import().icc_export()
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self.assertLess(im.dE76(test).max(), 6)
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im = test.icc_import()
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im2 = im.icc_export(depth = 16)
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self.assertEqual(im2.format, Vips.BandFormat.USHORT)
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im3 = im2.icc_import()
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self.assertLess((im - im3).abs().max(), 3)
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im = test.icc_import(intent = Vips.Intent.ABSOLUTE)
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im2 = im.icc_export(intent = Vips.Intent.ABSOLUTE)
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self.assertLess(im2.dE76(test).max(), 6)
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im = test.icc_import()
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im2 = im.icc_export(output_profile = "images/sRGB.icm")
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im3 = im.colourspace(Vips.Interpretation.SRGB)
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self.assertLess(im2.dE76(im3).max(), 6)
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before_profile = test.get_value("icc-profile-data")
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im = test.icc_transform("images/sRGB.icm")
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after_profile = im.get_value("icc-profile-data")
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im2 = test.icc_import()
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im3 = im2.colourspace(Vips.Interpretation.SRGB)
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self.assertLess(im.dE76(im3).max(), 6)
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self.assertNotEqual(len(before_profile), len(after_profile))
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im = test.icc_import(input_profile = "images/sRGB.icm")
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im2 = test.icc_import()
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self.assertLess(6, im.dE76(im2).max())
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im = test.icc_import(pcs = Vips.PCS.XYZ)
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self.assertEqual(im.interpretation, Vips.Interpretation.XYZ)
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im = test.icc_import()
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self.assertEqual(im.interpretation, Vips.Interpretation.LAB)
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if __name__ == '__main__':
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unittest.main()
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