#!/usr/bin/python import unittest import math #import logging #logging.basicConfig(level = logging.DEBUG) from gi.repository import Vips from vips8 import vips unsigned_formats = [Vips.BandFormat.UCHAR, Vips.BandFormat.USHORT, Vips.BandFormat.UINT] signed_formats = [Vips.BandFormat.CHAR, Vips.BandFormat.SHORT, Vips.BandFormat.INT] float_formats = [Vips.BandFormat.FLOAT, Vips.BandFormat.DOUBLE] complex_formats = [Vips.BandFormat.COMPLEX, Vips.BandFormat.DPCOMPLEX] int_formats = unsigned_formats + signed_formats noncomplex_formats = int_formats + float_formats all_formats = int_formats + float_formats + complex_formats colour_colourspaces = [Vips.Interpretation.XYZ, Vips.Interpretation.LAB, Vips.Interpretation.LCH, Vips.Interpretation.CMC, Vips.Interpretation.LABS, Vips.Interpretation.SCRGB, Vips.Interpretation.SRGB, Vips.Interpretation.RGB16, Vips.Interpretation.YXY] coded_colourspaces = [Vips.Interpretation.LABQ] mono_colourspaces = [Vips.Interpretation.GREY16, Vips.Interpretation.B_W] all_colourspaces = colour_colourspaces + mono_colourspaces + coded_colourspaces # an expanding zip ... if either of the args is not a list, duplicate it down # the other def zip_expand(x, y): if isinstance(x, list) and isinstance(y, list): return zip(x, y) elif isinstance(x, list): return [[i, y] for i in x] elif isinstance(y, list): return [[x, j] for j in y] else: return [[x, y]] # run a 1-ary function on a thing -- loop over elements if the # thing is a list def run_fn(fn, x): if isinstance(x, list): return [fn(i) for i in x] else: return fn(x) # run a 2-ary function on two things -- loop over elements pairwise if the # things are lists def run_fn2(fn, x, y): if isinstance(x, Vips.Image) or isinstance(y, Vips.Image): return fn(x, y) elif isinstance(x, list) or isinstance(y, list): return [fn(i, j) for i, j in zip_expand(x, y)] else: return fn(x, y) class TestColour(unittest.TestCase): # test a pair of things which can be lists for approx. equality def assertAlmostEqualObjects(self, a, b, places = 4, msg = ''): #print 'assertAlmostEqualObjects %s = %s' % (a, b) for x, y in zip_expand(a, b): self.assertAlmostEqual(x, y, places = places, msg = msg) # run a function on an image and on a single pixel, the results # should match def run_cmp(self, message, im, x, y, fn): a = im.getpoint(x, y) v1 = fn(a) im2 = fn(im) v2 = im2.getpoint(x, y) self.assertAlmostEqualObjects(v1, v2, msg = message) # run a function on a pair of images and on a pair of pixels, the results # should match def run_cmp2(self, message, left, right, x, y, fn): a = left.getpoint(x, y) b = right.getpoint(x, y) v1 = fn(a, b) after = fn(left, right) v2 = after.getpoint(x, y) self.assertAlmostEqualObjects(v1, v2, msg = message) # run a function on a pair of images # 50,50 and 10,10 should have different values on the test image def run_test2(self, message, left, right, fn): self.run_cmp2(message, left, right, 50, 50, lambda x, y: run_fn2(fn, x, y)) self.run_cmp2(message, left, right, 10, 10, lambda x, y: run_fn2(fn, x, y)) def setUp(self): im = Vips.Image.mask_ideal(100, 100, 0.5, reject = True, optical = True) self.colour = im * [1, 2, 3] + [2, 3, 4] self.mono = self.colour.extract_band(1) self.all_images = [self.mono, self.colour] def test_colourspace(self): # mid-grey in Lab ... put 42 in the extra band, it should be copied # unmodified test = Vips.Image.black(100, 100) + [50, 0, 0, 42] test = test.copy(interpretation = Vips.Interpretation.LAB) # a long series should come in a circle im = test for col in colour_colourspaces + [Vips.Interpretation.LAB]: im = im.colourspace(col) self.assertEqual(im.interpretation, col) pixel = im.getpoint(10, 10) self.assertAlmostEqual(pixel[3], 42, places = 2) before = test.getpoint(10, 10) after = im.getpoint(10, 10) self.assertAlmostEqualObjects(before, after, places = 1) # test Lab->XYZ on mid-grey # checked against http://www.brucelindbloom.com im = test.colourspace(Vips.Interpretation.XYZ) after = im.getpoint(10, 10) self.assertAlmostEqualObjects(after, [17.5064, 18.4187, 20.0547, 42]) # grey->colour->grey should be equal for mono_fmt in mono_colourspaces: test_grey = test.colourspace(mono_fmt) im = test_grey for col in colour_colourspaces + [mono_fmt]: im = im.colourspace(col) self.assertEqual(im.interpretation, col) [before, alpha_before] = test_grey.getpoint(10, 10) [after, alpha_after] = im.getpoint(10, 10) self.assertLess(abs(alpha_after - alpha_before), 1) if mono_fmt == Vips.Interpretation.GREY16: # GREY16 can wind up rather different due to rounding self.assertLess(abs(after - before), 30) else: # but 8-bit we should hit exactly self.assertLess(abs(after - before), 1) # test results from Bruce Lindbloom's calculator: # http://www.brucelindbloom.com def test_dE00(self): # put 42 in the extra band, it should be copied unmodified reference = Vips.Image.black(100, 100) + [50, 10, 20, 42] reference = reference.copy(interpretation = Vips.Interpretation.LAB) sample = Vips.Image.black(100, 100) + [40, -20, 10] sample = sample.copy(interpretation = Vips.Interpretation.LAB) difference = reference.dE00(sample) result, alpha = difference.getpoint(10, 10) self.assertAlmostEqual(result, 30.238, places = 3) self.assertAlmostEqual(alpha, 42.0, places = 3) def test_dE76(self): # put 42 in the extra band, it should be copied unmodified reference = Vips.Image.black(100, 100) + [50, 10, 20, 42] reference = reference.copy(interpretation = Vips.Interpretation.LAB) sample = Vips.Image.black(100, 100) + [40, -20, 10] sample = sample.copy(interpretation = Vips.Interpretation.LAB) difference = reference.dE76(sample) result, alpha = difference.getpoint(10, 10) self.assertAlmostEqual(result, 33.166, places = 3) self.assertAlmostEqual(alpha, 42.0, places = 3) # the vips CMC calculation is based on distance in a colorspace derived from # the CMC formula, so it won't match exactly ... see vips_LCh2CMC() for # details def test_dECMC(self): reference = Vips.Image.black(100, 100) + [50, 10, 20, 42] reference = reference.copy(interpretation = Vips.Interpretation.LAB) sample = Vips.Image.black(100, 100) + [55, 11, 23] sample = sample.copy(interpretation = Vips.Interpretation.LAB) difference = reference.dECMC(sample) result, alpha = difference.getpoint(10, 10) self.assertLess(abs(result - 4.97), 0.5) self.assertAlmostEqual(alpha, 42.0, places = 3) # hard to test ICC stuff without including test images # rely on the nip2 test suite for this if __name__ == '__main__': unittest.main()