def getPicture():
  file = pickAFile ();
  pict = makePicture(file);
  openPictureTool (pict)

def turnRed():
  brown = makeColor(122,86,62)
  file = pickAFile()
  picture = makePicture(file)
  for px in getPixels(picture):
    color = getColor(px)
    if distance(color,brown) < 25.0:
      redness = getRed(px)*1.5
      setRed(px,redness)
  show(picture)
  return(picture)

# function to show the problem between = and ==
def equalExample (val):
  print val
  if (val == 10):
     print "The value is 10"
  print val

def equalExample2 (val):
  print val
  #if (val = 10):
  #   print "The value is 10"
  print val

def posterize(picture):
  #loop through the pixels
  for p in getPixels(picture):
    #get the RGB values
    red = getRed(p)
    green = getGreen(p)
    blue = getBlue(p)

    #check and set red values
    #if red < 64:
    #  setRed(p, 31)
    #if red > 63 and red < 128:
    #  setRed(p, 95)
    #if red > 127 and red < 192:
    #  setRed(p, 159)
    #if red > 191 and red < 256:
    #  setRed(p, 223)

    # rewrite above if statements using elif and else
    if red < 64:
      setRed(p, 31)
    elif red < 128:
      setRed(p, 95)
    elif red < 192:
      setRed(p, 159)
    else:
      setRed(p, 223)

    #check and set green values
    if green < 64:
      setGreen(p, 31)
    if green > 63 and green < 128:
      setGreen(p, 95)
    if green > 127 and green < 192:
      setGreen(p, 159)
    if green > 191 and green < 256:
      setGreen(p, 223)

    #check and set blue values
    if blue < 64:
      setBlue(p, 31)
    if blue > 63 and blue < 128:
      setBlue(p, 95)
    if blue > 127 and blue < 192:
      setBlue(p, 159)
    if blue > 191 and blue < 256:
      setBlue(p, 223)

  openPictureTool (picture)

def usePosterize ():
  file = pickAFile ();
  pict = makePicture(file);
  posterize (pict)

def useSepiaTint ():
  file = pickAFile ();
  pict = makePicture(file);
  sepiaTint (pict)

def sepiaTint(picture):
  #Convert image to grayscale
  for pix in getPixels (picture):
       redAmount = getRed (pix)
       greenAmount = getGreen (pix)
       blueAmount = getBlue (pix)
       lum = (redAmount + greenAmount + blueAmount) / 3
       negColor = makeColor (lum, lum, lum)
       setColor(pix, negColor)
  #grayScaleNew(picture)

  #loop through picture to tint pixels
  for p in getPixels(picture):
    red = getRed(p)
    blue = getBlue(p)     #Note: = red now

    #tint shadows
    if red < 63:
      red = red*1.1
      blue = blue*0.9
    #tint midtones
    if red > 62 and red < 192:
      red = red*1.15
      blue = blue*0.85

    #tint highlights
    if red > 191:
      red = red*1.08
    if red > 255:
        red = 255

    blue = blue*0.93

    #set the new color values
    setBlue(p, blue)
    setRed(p, red)

  openPictureTool (picture)