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Premultiply RGBA images prior to transform and resize and undo after

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wiredfool 2013-10-04 13:25:32 -07:00
parent b9f94b7632
commit 10214bc6c4
1 changed files with 8 additions and 1 deletions
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9
PIL/Image.py
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@ -1309,6 +1309,9 @@ class Image:
if self.mode in ("1", "P"): if self.mode in ("1", "P"):
resample = NEAREST resample = NEAREST
if self.mode == 'RGBA':
return self.convert('RGBa').resize(size, resample).convert('RGBA')
if resample == ANTIALIAS: if resample == ANTIALIAS:
# requires stretch support (imToolkit & PIL 1.1.3) # requires stretch support (imToolkit & PIL 1.1.3)
try: try:
@ -1606,6 +1609,9 @@ class Image:
:returns: An Image object. :returns: An Image object.
""" """
if self.mode == 'RGBA':
return self.convert('RGBa').transform(size, method, data, resample, fill).convert('RGBA')
if isinstance(method, ImageTransformHandler): if isinstance(method, ImageTransformHandler):
return method.transform(size, self, resample=resample, fill=fill) return method.transform(size, self, resample=resample, fill=fill)
if hasattr(method, "getdata"): if hasattr(method, "getdata"):
@ -1613,6 +1619,7 @@ class Image:
method, data = method.getdata() method, data = method.getdata()
if data is None: if data is None:
raise ValueError("missing method data") raise ValueError("missing method data")
im = new(self.mode, size, None) im = new(self.mode, size, None)
if method == MESH: if method == MESH:
# list of quads # list of quads
@ -1620,7 +1627,7 @@ class Image:
im.__transformer(box, self, QUAD, quad, resample, fill) im.__transformer(box, self, QUAD, quad, resample, fill)
else: else:
im.__transformer((0, 0)+size, self, method, data, resample, fill) im.__transformer((0, 0)+size, self, method, data, resample, fill)
return im return im
def __transformer(self, box, image, method, data, def __transformer(self, box, image, method, data,