Create a function that takes a picture and creates a movie with the picture slowly turning into the negative from left-to-right. Maybe you do the leftmost 10 columns of pixels in the first frame, then the leftmost 20 columns are made negative in the second frame, and so on.

Question

What will be an ideal response?

Answer 1

```
def invertWipe(directory, picture):
#if each frame has 10 pixels changed, max frame is width/10
width = getWidth(picture)
height = getHeight(picture)
for num in range (1 ,width/10):
canvas = makeEmptyPicture (width,height)
pic = invertColor(picture,(num-1)*10,num*10, 0, height)
copy(pic, canvas, 0, 0)

numStr=str(num)
if num < 10:
writePictureTo ( canvas , directory +"//frame0"+ numStr +".jpg")
elif num >= 10:
writePictureTo ( canvas , directory +"//frame"+ numStr +".jpg")
movie = makeMovieFromInitialFile(directory+"/frame00.jpg");
return movie
def invertColor(picture, xMin, xMax, yMin, yMax):
#Convert section to grayscale
for x in range(xMin, xMax):
for y in range(yMin, yMax):
p = getPixel(picture, x, y)

setRed(p, 255-value)
setBlue(p, 255-value)
setGreen(p, 255-value)
```