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Merge pull request #993 from moriyoshi/fix/moriyoshi/gif-encoder-optimization-bug

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The optimization algorithm is only applicable to the image of mode="P" or "L".
This commit is contained in:
wiredfool 2014-11-27 10:36:34 -08:00
commit 42b59046e7
2 changed files with 13 additions and 4 deletions
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2
PIL/GifImagePlugin.py
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@ -433,7 +433,7 @@ def getheader(im, palette=None, info=None):
usedPaletteColors = paletteBytes = None usedPaletteColors = paletteBytes = None
if optimize: if im.mode in ("P", "L") and optimize:
usedPaletteColors = [] usedPaletteColors = []
# check which colors are used # check which colors are used

15
Tests/test_file_gif.py
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@ -28,13 +28,22 @@ class TestFileGif(PillowTestCase):
def test_optimize(self): def test_optimize(self):
from io import BytesIO from io import BytesIO
def test(optimize): def test_grayscale(optimize):
im = Image.new("L", (1, 1), 0) im = Image.new("L", (1, 1), 0)
file = BytesIO() file = BytesIO()
im.save(file, "GIF", optimize=optimize) im.save(file, "GIF", optimize=optimize)
return len(file.getvalue()) return len(file.getvalue())
self.assertEqual(test(0), 800)
self.assertEqual(test(1), 38) def test_bilevel(optimize):
im = Image.new("1", (1, 1), 0)
file = BytesIO()
im.save(file, "GIF", optimize=optimize)
return len(file.getvalue())
self.assertEqual(test_grayscale(0), 800)
self.assertEqual(test_grayscale(1), 38)
self.assertEqual(test_bilevel(0), 800)
self.assertEqual(test_bilevel(1), 800)
def test_optimize_full_l(self): def test_optimize_full_l(self):
from io import BytesIO from io import BytesIO