Write and test a function named sepia that converts a color image to sepia. This function should first call grayscale to convert the color image to grayscale. A code segment for transforming the grayscale values to achieve a sepia effect follows. Note that the value for green does not change.

def sepia(oldPixel):
  red = oldPixel.getRed()
  blue = oldPixel.getBlue()
  green = oldPixel.getGreen()
  if red < 63:
    red = red * 1.1
    blue = blue * 0.9
  elif red < 192:
    red = red * 1.15
    blue = blue * 0.85
  else:
    red = red * 1.08
    if blue > 0:
      blue = blue * 0.93
  newPixel = Pixel(red, green, blue)
  return newPixel