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Valid range for baseline jpeg qtables 0 to 255, fixed issue from using signed char instead of unsigned char. added test

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This commit is contained in:
Stephen Arthur 2016-04-06 18:47:51 -07:00
parent 9fa3fb98f3
commit b38c32ed70
2 changed files with 5 additions and 1 deletions
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2
PIL/JpegImagePlugin.py
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@ -640,7 +640,7 @@ def _save(im, fp, filename):
try:
if len(table) != 64:
raise
table = array.array('b', table)
table = array.array('B', table)
except TypeError:
raise ValueError("Invalid quantization table")
else:

4
Tests/test_file_jpeg.py
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@ -314,6 +314,10 @@ class TestFileJpeg(PillowTestCase):
30)
self.assert_image_similar(im, self.roundtrip(im, qtables='keep'), 30)
# valid bounds for baseline qtable
bounds_qtable = [int(s) for s in ("255 0 " * 32).split(None)]
self.roundtrip(im, qtables=[bounds_qtable])
# values from wizard.txt in jpeg9-a src package.
standard_l_qtable = [int(s) for s in """
16 11 10 16 24 40 51 61