1 files changed, 89 insertions, 0 deletions
diff --git a/PIL/ImageEnhance.py b/PIL/ImageEnhance.py
new file mode 100644
index 0000000..cddd084
--- /dev/null
+++ b/PIL/ImageEnhance.py
@@ -0,0 +1,89 @@
+#
+# 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)