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Code for transforming pictures


# A template function for transforming pictures
def transformPicture(pic):
  
  allThePixels = getPixels(pic)
  for currentPixel in allThePixels:
    # Do something to currentPixel by replacing line below with something useful
    pass

# This is the above template with the "pass" replaced by a block of three lines
# that darken the current pixel
def darken(pic):
  allThePixels = getPixels(pic)
  for currentPixel in allThePixels:
    setRed(currentPixel, getRed(currentPixel)/2)
    setGreen(currentPixel, getGreen(currentPixel)/2)
    setBlue(currentPixel, getBlue(currentPixel)/2)

# This is the above template with the "pass" replaced by a block of three lines
# flip the values of the current pixel to make a photographic negative
def negate(pic):
  allThePixels = getPixels(pic)
  for currentPixel in allThePixels:
    # Do something to currentPixel
    setRed(currentPixel, 255-getRed(currentPixel))
    setGreen(currentPixel, 255-getGreen(currentPixel))
    setBlue(currentPixel, 255-getBlue(currentPixel))

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