91 lines
2.7 KiB
Python
91 lines
2.7 KiB
Python
|
#
|
||
|
|
# 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.sgi.com/grafica/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.
|
||
|
|
#
|
||
|
|
|
||
|
|
import Image, ImageFilter, ImageStat
|
||
|
|
|
||
|
|
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 a solid grey image, factor 1.0 gives the original image.
|
||
|
|
|
||
|
|
class Contrast(_Enhance):
|
||
|
|
"Adjust image contrast"
|
||
|
|
def __init__(self, image):
|
||
|
|
self.image = image
|
||
|
|
mean = int(ImageStat.Stat(image.convert("L")).mean[0] + 0.5)
|
||
|
|
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)
|