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Fix for alpha preservation in ImageEnhance, #899

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wiredfool 2014-09-18 08:49:37 -07:00
parent 5ea966d869
commit 394f6d3249
1 changed files with 13 additions and 1 deletions
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14
PIL/ImageEnhance.py
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@ -47,8 +47,11 @@ class Color(_Enhance):
"""
def __init__(self, image):
self.image = image
self.degenerate = image.convert("L").convert(image.mode)
self.intermediate_mode = 'L'
if 'A' in image.getbands():
self.intermediate_mode = 'LA'
self.degenerate = image.convert(self.intermediate_mode).convert(image.mode)
class Contrast(_Enhance):
"""Adjust image contrast.
@ -62,6 +65,9 @@ class Contrast(_Enhance):
mean = int(ImageStat.Stat(image.convert("L")).mean[0] + 0.5)
self.degenerate = Image.new("L", image.size, mean).convert(image.mode)
if 'A' in image.getbands():
self.degenerate.putalpha(image.split()[-1])
class Brightness(_Enhance):
"""Adjust image brightness.
@ -74,6 +80,9 @@ class Brightness(_Enhance):
self.image = image
self.degenerate = Image.new(image.mode, image.size, 0)
if 'A' in image.getbands():
self.degenerate.putalpha(image.split()[-1])
class Sharpness(_Enhance):
"""Adjust image sharpness.
@ -85,3 +94,6 @@ class Sharpness(_Enhance):
def __init__(self, image):
self.image = image
self.degenerate = image.filter(ImageFilter.SMOOTH)
if 'A' in image.getbands():
self.degenerate.putalpha(image.split()[-1])