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Sane quantize defaults for RGBA->P, fixes #544

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wiredfool 2014-03-25 21:35:20 -07:00
parent 9518214980
commit abebac25cc
1 changed files with 15 additions and 1 deletions
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16
PIL/Image.py
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@ -735,6 +735,9 @@ class Image:
im = self.im.convert_matrix(mode, matrix)
return self._new(im)
if mode == "P" and self.mode == "RGBA":
return self.quantize(colors)
if mode == "P" and palette == ADAPTIVE:
im = self.im.quantize(colors)
new = self._new(im)
@ -762,7 +765,7 @@ class Image:
return self._new(im)
def quantize(self, colors=256, method=0, kmeans=0, palette=None):
def quantize(self, colors=256, method=None, kmeans=0, palette=None):
# methods:
# 0 = median cut
@ -773,7 +776,18 @@ class Image:
# quantizer interface in a later version of PIL.
self.load()
if method is None:
# defaults:
method = 0
if self.mode == 'RGBA':
method = 2
if self.mode == 'RGBA' and method != 2:
# Caller specified an invalid mode.
raise ValueError('Fast Octree (method == 2) is the ' +
' only valid method for quantizing RGBA images')
if palette:
# use palette from reference image
palette.load()