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Images, Pixels, and Nested Loops

Here is my program to make a thick red border at the top of my picture:

filename=pickAFile()
pic=makePicture(filename)
show(pic)
w = getWidth(pic)
col=1
while col<w:
  row=1
  while row<100:
    pixel = getPixel(pic,col,row)
    setColor(pixel,red)
    row=row+1
  col=col+1
repaint(pic)




Here is the code for every 4th line to be green:

filename=pickAFile()
pic=makePicture(filename)
show(pic)
w = getWidth(pic)
col=1
while col<w:
  row=1
  while row<699:
    pixel = getPixel(pic,col,row)
    setColor(pixel,green)
    row=row+3
  col=col+1
repaint(pic)
writePictureTo(pic,"H://obama.jpg")