diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py index 6fb1d7cc5d3a..a867d4e4a34f 100644 --- a/lib/matplotlib/__init__.py +++ b/lib/matplotlib/__init__.py @@ -1114,6 +1114,7 @@ def tk_window_focus(): 'matplotlib.tests.test_collections', 'matplotlib.tests.test_colorbar', 'matplotlib.tests.test_colors', + 'matplotlib.tests.test_compare_images', 'matplotlib.tests.test_contour', 'matplotlib.tests.test_dates', 'matplotlib.tests.test_delaunay', diff --git a/lib/matplotlib/testing/compare.py b/lib/matplotlib/testing/compare.py index 674c0f87a217..62a254b34aef 100644 --- a/lib/matplotlib/testing/compare.py +++ b/lib/matplotlib/testing/compare.py @@ -14,7 +14,6 @@ from distutils import version import hashlib import math -import operator import os import numpy as np import shutil @@ -251,37 +250,21 @@ def crop_to_same(actual_path, actual_image, expected_path, expected_image): return actual_image, expected_image def calculate_rms(expectedImage, actualImage): - # compare the resulting image histogram functions - expected_version = version.LooseVersion("1.6") - found_version = version.LooseVersion(np.__version__) + # calculate the per-pixel errors, then compute the root mean square error + num_values = np.prod(expectedImage.shape) + abs_diff_image = abs(expectedImage - actualImage) # On Numpy 1.6, we can use bincount with minlength, which is much faster than # using histogram + expected_version = version.LooseVersion("1.6") + found_version = version.LooseVersion(np.__version__) if found_version >= expected_version: - rms = 0 - - for i in xrange(0, 3): - h1p = expectedImage[:,:,i] - h2p = actualImage[:,:,i] - - h1h = np.bincount(h1p.ravel(), minlength=256) - h2h = np.bincount(h2p.ravel(), minlength=256) - - rms += np.sum(np.power((h1h-h2h), 2)) + histogram = np.bincount(abs_diff_image.ravel(), minlength=256) else: - rms = 0 - bins = np.arange(257) - - for i in xrange(0, 3): - h1p = expectedImage[:,:,i] - h2p = actualImage[:,:,i] + histogram = np.histogram(abs_diff_image, bins=np.arange(257))[0] - h1h = np.histogram(h1p, bins=bins)[0] - h2h = np.histogram(h2p, bins=bins)[0] - - rms += np.sum(np.power((h1h-h2h), 2)) - - rms = np.sqrt(rms / (256 * 3)) + sum_of_squares = np.sum(histogram * np.arange(len(histogram))**2) + rms = np.sqrt(float(sum_of_squares) / num_values) return rms @@ -299,8 +282,9 @@ def compare_images( expected, actual, tol, in_decorator=False ): = INPUT VARIABLES - expected The filename of the expected image. - actual The filename of the actual image. - - tol The tolerance (a unitless float). This is used to - determine the 'fuzziness' to use when comparing images. + - tol The tolerance (a color value difference, where 255 is the + maximal difference). The test fails if the average pixel + difference is greater than this value. - in_decorator If called from image_comparison decorator, this should be True. (default=False) ''' @@ -316,37 +300,25 @@ def compare_images( expected, actual, tol, in_decorator=False ): # open the image files and remove the alpha channel (if it exists) expectedImage = _png.read_png_int( expected ) actualImage = _png.read_png_int( actual ) + expectedImage = expectedImage[:, :, :3] + actualImage = actualImage[:, :, :3] actualImage, expectedImage = crop_to_same(actual, actualImage, expected, expectedImage) - # compare the resulting image histogram functions - expected_version = version.LooseVersion("1.6") - found_version = version.LooseVersion(np.__version__) + # convert to signed integers, so that the images can be subtracted without + # overflow + expectedImage = expectedImage.astype(np.int16) + actualImage = actualImage.astype(np.int16) rms = calculate_rms(expectedImage, actualImage) diff_image = make_test_filename(actual, 'failed-diff') - if ( (rms / 10000.0) <= tol ): + if rms <= tol: if os.path.exists(diff_image): os.unlink(diff_image) return None - # For Agg-rendered images, we can retry by ignoring pixels with - # differences of only 1 - if extension == 'png': - # Remove differences of only 1 - diffImage = np.abs(np.asarray(actualImage, dtype=np.int) - - np.asarray(expectedImage, dtype=np.int)) - actualImage = np.where(diffImage <= 1, expectedImage, actualImage) - - rms = calculate_rms(expectedImage, actualImage) - - if ( (rms / 10000.0) <= tol ): - if os.path.exists(diff_image): - os.unlink(diff_image) - return None - save_diff_image( expected, actual, diff_image ) if in_decorator: @@ -360,7 +332,7 @@ def compare_images( expected, actual, tol, in_decorator=False ): else: # old-style call from mplTest directory msg = " Error: Image files did not match.\n" \ - " RMS Value: " + str( rms / 10000.0 ) + "\n" \ + " RMS Value: " + str( rms ) + "\n" \ " Expected:\n " + str( expected ) + "\n" \ " Actual:\n " + str( actual ) + "\n" \ " Difference:\n " + str( diff_image ) + "\n" \ diff --git a/lib/matplotlib/testing/decorators.py b/lib/matplotlib/testing/decorators.py index 36414f0e3af5..0daef270c766 100644 --- a/lib/matplotlib/testing/decorators.py +++ b/lib/matplotlib/testing/decorators.py @@ -165,7 +165,7 @@ def do_test(): yield (do_test,) -def image_comparison(baseline_images=None, extensions=None, tol=1e-3, +def image_comparison(baseline_images=None, extensions=None, tol=10, freetype_version=None, remove_text=False, savefig_kwarg=None): """ diff --git a/lib/matplotlib/tests/__init__.py b/lib/matplotlib/tests/__init__.py index 9f6152124e03..bd133a4f6645 100644 --- a/lib/matplotlib/tests/__init__.py +++ b/lib/matplotlib/tests/__init__.py @@ -13,4 +13,3 @@ def setup(): rcParams['font.family'] = 'Bitstream Vera Sans' rcParams['text.hinting'] = False rcParams['text.hinting_factor'] = 8 - rcParams['text.antialiased'] = False diff --git a/lib/matplotlib/tests/baseline_images/test_axes/axhspan_epoch.png b/lib/matplotlib/tests/baseline_images/test_axes/axhspan_epoch.png index 723b1b975f0f..372261270a81 100644 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a/lib/matplotlib/tests/baseline_images/test_transforms/pre_transform_data.png b/lib/matplotlib/tests/baseline_images/test_transforms/pre_transform_data.png index df8de149d444..712e0f847234 100644 Binary files a/lib/matplotlib/tests/baseline_images/test_transforms/pre_transform_data.png and b/lib/matplotlib/tests/baseline_images/test_transforms/pre_transform_data.png differ diff --git a/lib/matplotlib/tests/baseline_images/test_triangulation/tripcolor1.png b/lib/matplotlib/tests/baseline_images/test_triangulation/tripcolor1.png index 5d55776015ba..25ae81a7d071 100644 Binary files a/lib/matplotlib/tests/baseline_images/test_triangulation/tripcolor1.png and b/lib/matplotlib/tests/baseline_images/test_triangulation/tripcolor1.png differ diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py index dd906f0b7c42..0b1a46d9965d 100644 --- a/lib/matplotlib/tests/test_axes.py +++ b/lib/matplotlib/tests/test_axes.py @@ -501,7 +501,7 @@ def test_imshow(): ax.imshow(r) -@image_comparison(baseline_images=['imshow_clip'], tol=1e-2) +@image_comparison(baseline_images=['imshow_clip']) def test_imshow_clip(): # As originally reported by Gellule Xg @@ -543,7 +543,7 @@ def test_polycollection_joinstyle(): ax.set_ybound(0, 3) @image_comparison(baseline_images=['fill_between_interpolate'], - tol=1e-2, remove_text=True) + remove_text=True) def test_fill_between_interpolate(): x = np.arange(0.0, 2, 0.02) y1 = np.sin(2*np.pi*x) @@ -612,8 +612,7 @@ def test_symlog2(): ax.grid(True) ax.set_ylim(-0.1, 0.1) -@image_comparison(baseline_images=['pcolormesh'], tol=0.02, - remove_text=True) +@image_comparison(baseline_images=['pcolormesh'], remove_text=True) def test_pcolormesh(): n = 12 x = np.linspace(-1.5,1.5,n) diff --git a/lib/matplotlib/tests/test_backend_pgf.py b/lib/matplotlib/tests/test_backend_pgf.py index e9ceaec7618d..98b3f1aa6721 100644 --- a/lib/matplotlib/tests/test_backend_pgf.py +++ b/lib/matplotlib/tests/test_backend_pgf.py @@ -57,7 +57,7 @@ def compare_figure(fname): expected = os.path.join(result_dir, "expected_%s" % fname) shutil.copyfile(os.path.join(baseline_dir, fname), expected) - err = compare_images(expected, actual, tol=5e-3) + err = compare_images(expected, actual) if err: raise ImageComparisonFailure('images not close: %s vs. %s' % (actual, expected)) diff --git a/lib/matplotlib/tests/test_bbox_tight.py b/lib/matplotlib/tests/test_bbox_tight.py index b46cd443b54b..d85a69fe3d7d 100644 --- a/lib/matplotlib/tests/test_bbox_tight.py +++ b/lib/matplotlib/tests/test_bbox_tight.py @@ -4,7 +4,7 @@ import numpy as np @image_comparison(baseline_images=['bbox_inches_tight'], remove_text=True, - savefig_kwarg=dict(bbox_inches='tight')) + savefig_kwarg=dict(bbox_inches='tight'), tol=15) def test_bbox_inches_tight(): "Test that a figure saved using bbox_inches'tight' is clipped right" rcParams.update(rcParamsDefault) diff --git a/lib/matplotlib/tests/test_compare_images.py b/lib/matplotlib/tests/test_compare_images.py new file mode 100644 index 000000000000..df58dff7d5e9 --- /dev/null +++ b/lib/matplotlib/tests/test_compare_images.py @@ -0,0 +1,86 @@ +from __future__ import print_function +from matplotlib.testing.compare import compare_images +from matplotlib.testing.decorators import _image_directories +from nose.tools import assert_equal, assert_not_equal, assert_almost_equal +import os +import shutil + +baseline_dir, result_dir = _image_directories(lambda: 'dummy func') + +# Tests of the image comparison algorithm. +def image_comparison_expect_rms(im1, im2, tol, expect_rms): + """Compare two images, expecting a particular RMS error. + + im1 and im2 are filenames relative to the baseline_dir directory. + + tol is the tolerance to pass to compare_images. + + expect_rms is the expected RMS value, or None. If None, the test will + succeed if compare_images succeeds. Otherwise, the test will succeed if + compare_images fails and returns an RMS error almost equal to this value. + """ + im1 = os.path.join(baseline_dir, im1) + im2_src = os.path.join(baseline_dir, im2) + im2 = os.path.join(result_dir, im2) + # Move im2 from baseline_dir to result_dir. This will ensure that + # compare_images writes the diff file to result_dir, instead of trying to + # write to the (possibly read-only) baseline_dir. + shutil.copyfile(im2_src, im2) + results = compare_images(im1, im2, tol=tol, in_decorator=True) + + if expect_rms is None: + assert_equal(None, results) + else: + assert_not_equal(None, results) + assert_almost_equal(expect_rms, results['rms'], places=4) + +def test_image_compare_basic(): + """Test comparison of an image and the same image with minor differences.""" + # This expects the images to compare equal under normal tolerance, and have + # a small RMS. + im1 = 'basn3p02.png' + im2 = 'basn3p02-minorchange.png' + image_comparison_expect_rms(im1, im2, tol=10, expect_rms=None) + + # Now test with no tolerance. + image_comparison_expect_rms(im1, im2, tol=0, expect_rms=6.50646) + +def test_image_compare_1px_offset(): + """Test comparison with an image that is shifted by 1px in the X axis.""" + im1 = 'basn3p02.png' + im2 = 'basn3p02-1px-offset.png' + image_comparison_expect_rms(im1, im2, tol=0, expect_rms=90.15611) + +def test_image_compare_half_1px_offset(): + """Test comparison with an image with half the pixels shifted by 1px in the + X axis.""" + im1 = 'basn3p02.png' + im2 = 'basn3p02-half-1px-offset.png' + image_comparison_expect_rms(im1, im2, tol=0, expect_rms=63.75) + +def test_image_compare_scrambled(): + """Test comparison of an image and the same image scrambled.""" + # This expects the images to compare completely different, with a very large + # RMS. + # Note: The image has been scrambled in a specific way, by having each + # color component of each pixel randomly placed somewhere in the image. It + # contains exactly the same number of pixels of each color value of R, G + # and B, but in a totally different position. + im1 = 'basn3p02.png' + im2 = 'basn3p02-scrambled.png' + # Test with no tolerance to make sure that we pick up even a very small RMS + # error. + image_comparison_expect_rms(im1, im2, tol=0, expect_rms=172.63582) + +def test_image_compare_shade_difference(): + """Test comparison of an image and a slightly brighter image.""" + # The two images are solid color, with the second image being exactly 1 + # color value brighter. + # This expects the images to compare equal under normal tolerance, and have + # an RMS of exactly 1. + im1 = 'all127.png' + im2 = 'all128.png' + image_comparison_expect_rms(im1, im2, tol=0, expect_rms=1.0) + + # Now test the reverse comparison. + image_comparison_expect_rms(im2, im1, tol=0, expect_rms=1.0) diff --git a/lib/matplotlib/tests/test_image.py b/lib/matplotlib/tests/test_image.py index f06192534581..aa1c1621dd2a 100644 --- a/lib/matplotlib/tests/test_image.py +++ b/lib/matplotlib/tests/test_image.py @@ -56,7 +56,7 @@ def test_interp_nearest_vs_none(): ax2.set_title('interpolation nearest') -@image_comparison(baseline_images=['figimage-0', 'figimage-1'], extensions=['png'], tol=1.5e-3) +@image_comparison(baseline_images=['figimage-0', 'figimage-1'], extensions=['png']) def test_figimage(): 'test the figimage method' @@ -159,7 +159,7 @@ def test_image_clip(): im = ax.imshow(d, extent=(-pi,pi,-pi/2,pi/2)) -@image_comparison(baseline_images=['imshow'], tol=1.5e-3, remove_text=True) +@image_comparison(baseline_images=['imshow'], remove_text=True) def test_imshow(): import numpy as np import matplotlib.pyplot as plt diff --git a/lib/matplotlib/tests/test_legend.py b/lib/matplotlib/tests/test_legend.py index 3aea41ed6c4d..083f3898daa1 100644 --- a/lib/matplotlib/tests/test_legend.py +++ b/lib/matplotlib/tests/test_legend.py @@ -4,7 +4,7 @@ import matplotlib.pyplot as plt import matplotlib as mpl -@image_comparison(baseline_images=['legend_auto1'], tol=1.5e-3, remove_text=True) +@image_comparison(baseline_images=['legend_auto1'], remove_text=True) def test_legend_auto1(): 'Test automatic legend placement' fig = plt.figure() diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py index e543b07a68ed..6021bff7aa14 100644 --- a/lib/matplotlib/tests/test_mathtext.py +++ b/lib/matplotlib/tests/test_mathtext.py @@ -140,7 +140,7 @@ def make_set(basename, fontset, tests, extensions=None): def make_test(filename, test): @image_comparison(baseline_images=[filename], extensions=extensions, - freetype_version=('2.4.5', '2.4.9')) + freetype_version=('2.4.5', '2.4.9'), tol=32) def single_test(): matplotlib.rcParams['mathtext.fontset'] = fontset fig = plt.figure(figsize=(5.25, 0.75)) diff --git a/lib/matplotlib/tests/test_simplification.py b/lib/matplotlib/tests/test_simplification.py index 50b025db01b5..f5247ce17ad4 100644 --- a/lib/matplotlib/tests/test_simplification.py +++ b/lib/matplotlib/tests/test_simplification.py @@ -28,7 +28,7 @@ def test_clipping(): ax.plot(t, s, linewidth=1.0) ax.set_ylim((-0.20, -0.28)) -@image_comparison(baseline_images=['overflow'], tol=1e-2, remove_text=True) +@image_comparison(baseline_images=['overflow'], remove_text=True) def test_overflow(): x = np.array([1.0,2.0,3.0,2.0e5]) y = np.arange(len(x))