#
#  Convert an image from color to grayscale, displaying both the original
#  image and the grayscale version.
#
from SimpleGraphics import *

# Load and display the color image
img = loadImage("Brickosaurus.gif")
drawImage(img, 0, 0)

# Create a blank image with the same size as the color image
gray_img = createImage(getWidth(img), getHeight(img))

# For each row in the image...
for y in range(0, getHeight(img)):
  # For each column in row...
  for x in range(0, getWidth(img)):
    # Convert the color into gray
    r, g, b = getPixel(img, x, y)
    avg = (r + g + b) / 3

    # Store the gray pixel into the grayscale image
    putPixel(gray_img, x, y, avg, avg, avg)

# Display the grayscale image
drawImage(gray_img, getWidth(img), 0)