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diff --git a/PIL/ImageEnhance.py b/PIL/ImageEnhance.py
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--- a/PIL/ImageEnhance.py
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-#
-# The Python Imaging Library.
-# $Id: ImageEnhance.py 2134 2004-10-06 08:55:20Z fredrik $
-#
-# image enhancement classes
-#
-# For a background, see "Image Processing By Interpolation and
-# Extrapolation", Paul Haeberli and Douglas Voorhies.  Available
-# at http://www.sgi.com/grafica/interp/index.html
-#
-# History:
-#       96-03-23 fl     Created
-#
-# Copyright (c) Secret Labs AB 1997.
-# Copyright (c) Fredrik Lundh 1996.
-#
-# See the README file for information on usage and redistribution.
-#
-
-import Image, ImageFilter
-
-class _Enhance:
-
-    ##
-    # Returns an enhanced image. The enhancement factor is a floating
-    # point value controlling the enhancement. Factor 1.0 always
-    # returns a copy of the original image, lower factors mean less
-    # colour (brightness, contrast, etc), and higher values more.
-    # There are no restrictions on this value.
-    #
-    # @param factor Enhancement factor.
-    # @return An enhanced image.
-
-    def enhance(self, factor):
-        return Image.blend(self.degenerate, self.image, factor)
-
-##
-# Color enhancement object.
-# <p>
-# This class can be used to adjust the colour balance of an image, in
-# a manner similar to the controls on a colour TV set.  An enhancement
-# factor of 0.0 gives a black and white image, a factor of 1.0 gives
-# the original image.
-
-class Color(_Enhance):
-    "Adjust image colour balance"
-    def __init__(self, image):
-        self.image = image
-        self.degenerate = image.convert("L").convert(image.mode)
-
-##
-# Contrast enhancement object.
-# <p>
-# This class can be used to control the contrast of an image, similar
-# to the contrast control on a TV set.  An enhancement factor of 0.0
-# gives an solid grey image, factor 1.0 gives the original image.
-
-class Contrast(_Enhance):
-    "Adjust image contrast"
-    def __init__(self, image):
-        self.image = image
-        mean = reduce(lambda a,b: a+b, image.convert("L").histogram())/256.0
-        self.degenerate = Image.new("L", image.size, mean).convert(image.mode)
-
-##
-# Brightness enhancement object.
-# <p>
-# This class can be used to control the brighntess of an image.  An
-# enhancement factor of 0.0 gives a black image, factor 1.0 gives the
-# original image.
-
-class Brightness(_Enhance):
-    "Adjust image brightness"
-    def __init__(self, image):
-        self.image = image
-        self.degenerate = Image.new(image.mode, image.size, 0)
-
-##
-# Sharpness enhancement object.
-# <p>
-# This class can be used to adjust the sharpness of an image.  The
-# enhancement factor 0.0 gives a blurred image, 1.0 gives the original
-# image, and a factor of 2.0 gives a sharpened image.
-
-class Sharpness(_Enhance):
-    "Adjust image sharpness"
-    def __init__(self, image):
-        self.image = image
-        self.degenerate = image.filter(ImageFilter.SMOOTH)