Help with my image editor.

I'm working on a small image editor with python and I am getting blank
rows in my test pictures. Can someone look over my code and give some
advice?

def expand_height(picture, factor):
height= media.get_height(pic)
#width=media.get_width(pic)
new_height=height*factor
newpic=media.create_picture(media.get_width(pic), new_height,
media.black)
for pix in pic:
x = media.get_x(pix)
y = media.get_y(pix)

newpixel = media.get_pixel(newpic, x, (y*factor) )
new_red = newpixel.get_red() + media.get_red (pix)
#new_blue = newpixel.get_blue() + media.get_blue (pix)
#new_green = newpixel.get_green() + media.get_green (pix)
media.set_red(newpixel, new_red)
#media.set_green(newpixel, new_green)
#media.set_blue(newpixel, new_blue)

I know this is not with the normal python media package so some wont
have these functions, but I need advice/help on the algorithm's
structure. Help me fill these blank rows!

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