Representing Data with Images and Sound 2.9

from PIL import Image    #Import the Image module from the PIL library

image = Image.open('image.png')    #Create a path to the image file

rgb_image = image.convert('RGB')    #Convert the image to RGB

width, height = image.size     #Assign the image's width and height to variables

lighten_image = Image.new('RGB', (width,height))     #Create a grid for the output image
sepia_image = Image.new('RGB', (width,height))

#Set up loops to modify each pixel within the image
for row in range(height):
    for col in range(width):
        r, g, b = rgb_image.getpixel((col, row))
         # a lighten filter
        lighten_image.putpixel((col, row), (min(255, r * 2),min(255, g * 2),min(255, b * 2) ))
         # a sepia filter
        sepia_image.putpixel((col, row),
                              (min(255, int((0.393 * r) + (0.769 * g) + (0.189 * b))),
                               min(255, int((0.349 * r) + (0.686 * g) + (0.168 * b))),
                               min(255, int((0.272 * r) + (0.534 * g) + (0.131 * b)))
                               ))

lighten_image.save("lightened.png")
sepia_image.save("sepia.png")

lighten_image.show()
sepia_image.show()