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Merge pull request #1128 from hugovk/noise

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Fix ImagingEffectNoise
This commit is contained in:
wiredfool 2015-03-08 18:29:44 -07:00
commit 4566a4dcbe
2 changed files with 4 additions and 6 deletions
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6
Tests/test_image.py
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@ -168,8 +168,6 @@ class TestImage(PillowTestCase):
ValueError,
lambda: Image.effect_mandelbrot(size, extent, quality))
@unittest.skipUnless(sys.platform.startswith('win32'),
"Stalls on Travis CI, passes on Windows")
def test_effect_noise(self):
# Arrange
size = (100, 100)
@ -180,8 +178,8 @@ class TestImage(PillowTestCase):
# Assert
self.assertEqual(im.size, (100, 100))
self.assertEqual(im.getpixel((0, 0)), 60)
self.assertEqual(im.getpixel((0, 1)), 28)
self.assertEqual(im.mode, "L")
self.assertNotEqual(im.getpixel((0, 0)), im.getpixel((0, 1)))
def test_effect_spread(self):
# Arrange

4
libImaging/Effects.c
View File

@ -98,8 +98,8 @@ ImagingEffectNoise(int xsize, int ysize, float sigma)
/* after numerical recipes */
double v1, v2, radius, factor;
do {
v1 = rand()*(2.0/32767.0) - 1.0;
v2 = rand()*(2.0/32767.0) - 1.0;
v1 = rand()*(2.0/RAND_MAX) - 1.0;
v2 = rand()*(2.0/RAND_MAX) - 1.0;
radius= v1*v1 + v2*v2;
} while (radius >= 1.0);
factor = sqrt(-2.0*log(radius)/radius);