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+#
+# The Python Imaging Library.
+# $Id$
+#
+# image enhancement classes
+#
+# For a background, see "Image Processing By Interpolation and
+# Extrapolation", Paul Haeberli and Douglas Voorhies. Available
+# at http://www.graficaobscura.com/interp/index.html
+#
+# History:
+# 1996-03-23 fl Created
+# 2009-06-16 fl Fixed mean calculation
+#
+# Copyright (c) Secret Labs AB 1997.
+# Copyright (c) Fredrik Lundh 1996.
+#
+# See the README file for information on usage and redistribution.
+#
+from __future__ import annotations
+
+from . import Image, ImageFilter, ImageStat
+
+
+class _Enhance:
+ image: Image.Image
+ degenerate: Image.Image
+
+ def enhance(self, factor: float) -> Image.Image:
+ """
+ Returns an enhanced image.
+
+ :param factor: A floating point value controlling the enhancement.
+ Factor 1.0 always returns a copy of the original image,
+ lower factors mean less color (brightness, contrast,
+ etc), and higher values more. There are no restrictions
+ on this value.
+ :rtype: :py:class:`~PIL.Image.Image`
+ """
+ return Image.blend(self.degenerate, self.image, factor)
+
+
+class Color(_Enhance):
+ """Adjust image color balance.
+
+ 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.
+ """
+
+ def __init__(self, image: Image.Image) -> None:
+ self.image = image
+ self.intermediate_mode = "L"
+ if "A" in image.getbands():
+ self.intermediate_mode = "LA"
+
+ if self.intermediate_mode != image.mode:
+ image = image.convert(self.intermediate_mode).convert(image.mode)
+ self.degenerate = image
+
+
+class Contrast(_Enhance):
+ """Adjust image contrast.
+
+ 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 a solid gray image. A factor of 1.0 gives the original image.
+ """
+
+ def __init__(self, image: Image.Image) -> None:
+ self.image = image
+ if image.mode != "L":
+ image = image.convert("L")
+ mean = int(ImageStat.Stat(image).mean[0] + 0.5)
+ self.degenerate = Image.new("L", image.size, mean)
+ if self.degenerate.mode != self.image.mode:
+ self.degenerate = self.degenerate.convert(self.image.mode)
+
+ if "A" in self.image.getbands():
+ self.degenerate.putalpha(self.image.getchannel("A"))
+
+
+class Brightness(_Enhance):
+ """Adjust image brightness.
+
+ This class can be used to control the brightness of an image. An
+ enhancement factor of 0.0 gives a black image. A factor of 1.0 gives the
+ original image.
+ """
+
+ def __init__(self, image: Image.Image) -> None:
+ self.image = image
+ self.degenerate = Image.new(image.mode, image.size, 0)
+
+ if "A" in image.getbands():
+ self.degenerate.putalpha(image.getchannel("A"))
+
+
+class Sharpness(_Enhance):
+ """Adjust image sharpness.
+
+ This class can be used to adjust the sharpness of an image. An
+ enhancement factor of 0.0 gives a blurred image, a factor of 1.0 gives the
+ original image, and a factor of 2.0 gives a sharpened image.
+ """
+
+ def __init__(self, image: Image.Image) -> None:
+ self.image = image
+ self.degenerate = image.filter(ImageFilter.SMOOTH)
+
+ if "A" in image.getbands():
+ self.degenerate.putalpha(image.getchannel("A"))