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minor addition

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This commit is contained in:
David Schmidt 2013-05-23 14:31:48 +02:00
parent a466b3e099
commit 5cd1b9f01e
1 changed files with 3 additions and 3 deletions
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6
PIL/GifImagePlugin.py
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@ -355,7 +355,7 @@ def getheader(im, palette=None, info=None):
# create the global palette
if im.mode == "P":
# colour palette
if countUsedPaletteColors > 0:
if countUsedPaletteColors > 0 and countUsedPaletteColors < 256:
paletteBytes = b"";
# pick only the used colors from the palette
for i in usedPaletteColors:
@ -364,7 +364,7 @@ def getheader(im, palette=None, info=None):
paletteBytes = im.im.getpalette("RGB")[:768]
else:
# greyscale
if countUsedPaletteColors > 0:
if countUsedPaletteColors > 0 and countUsedPaletteColors < 256:
paletteBytes = b"";
# add only the used grayscales to the palette
for i in usedPaletteColors:
@ -391,7 +391,7 @@ def getheader(im, palette=None, info=None):
# end of screen descriptor header
# add the missing amount of bytes
# the palette can only be 2<<n in size
# the palette has to be 2<<n in size
actualTargetSizeDiff = (2<<colorTableSize) - len(paletteBytes)//3
if actualTargetSizeDiff > 0:
paletteBytes += o8(0) * 3 * actualTargetSizeDiff