# Code from Lecture on 2/8/2007

# First attempt at making a sunset
# This may cause overflow with the red color amount
def makeSunset1():
   # get the picture
   file = pickAFile ()
   pict = makePicture(file)
   openPictureTool (pict)

   # loop for each pixel in the picture
   for pix in getPixels (pict):
       # modify the red amount in each pixel
       value = getRed (pix)
       # multiplying by 1.25 may result in overflow
       # if the red value is already very large
       newValue = value * 1.25
       setRed (pix, newValue)

   # show the resulting image
   openPictureTool (pict)

# Second and better attempt at making a sunset
def makeSunset2():
   file = pickAFile ()
   pict = makePicture(file)
   openPictureTool (pict)

   for pix in getPixels (pict):
       value = getGreen (pix)
       newValue = value * 0.7
       setGreen (pix, newValue)

       value = getBlue (pix)
       newValue = value * 0.7
       setBlue (pix, newValue)

   openPictureTool (pict)

# Make a color negative image
def makeNegative():
   file = pickAFile ()
   pict = makePicture(file)
   openPictureTool (pict)

   for pix in getPixels (pict):
       redAmount = getRed (pix)
       greenAmount = getGreen (pix)
       blueAmount = getBlue (pix)
       negColor = makeColor (255-redAmount,255-greenAmount, 255-blueAmount)
       setColor(pix, negColor)

   openPictureTool (pict)


# Make a color negative image
def makeNegative2():
   file = pickAFile ()
   pict = makePicture(file)
   openPictureTool (pict)

   for pix in getPixels (pict):
       redAmount = getRed (pix)
       greenAmount = getGreen (pix)
       blueAmount = getBlue (pix)
       negColor = makeColor (255-redAmount,255-greenAmount, 255-blueAmount)
       setColor(pix, negColor)

   # show the negative image
   openPictureTool (pict)

   for pix in getPixels (pict):
       redAmount = getRed (pix)
       greenAmount = getGreen (pix)
       blueAmount = getBlue (pix)
       negColor = makeColor (255-redAmount,255-greenAmount, 255-blueAmount)
       setColor(pix, negColor)

   # show of negative-negative image (should be back to the original)
   openPictureTool (pict)

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)