Instructions images.py posterize.pysmokey.gif+ Define and test a function named posterize This function expects an image and a tuple of RGB values as arguments. The function modifies the image like the blackAndWhite function, but it uses the given RGB values instead of black. 1 2 3 images . py 4 5 Revised for Python 3.2, 2011 7 This module, written by Kenneth Lanbert, supp Instructions images.py posterize.pysmokey.gif+ Define and test a function named posterize This function expects an image and a tuple of RGB values as arguments. The function modifies the image like the blackAndWhite function, but it uses the given RGB values instead of black. 1 2 3 images . py 4 5 Revised for Python 3.2, 2011 7 This module, written by Kenneth Lanbert, supp