Write a function to change a picture to grayscale and then negate it.

Question

Note: All one has to do is combine the grayscale and negate methods

Answer 1

```
def grayscale(picture):
for p in getPixels(picture):
intensity = (getRed(p)+getGreen(p)+getBlue(p))/3 setColor(p,makeColor(intensity ,intensity ,intensity)) for px in getPixels(picture):
red=getRed(px)
green=getGreen(px)
blue=getBlue(px)
negColor=makeColor(255-red, 255-green, 255-blue) setColor(px,negColor)
```

OR (more simply)

```
def grayscale(picture):
for p in getPixels(picture):
intensity = (getRed(p)+getGreen(p)+getBlue(p))/3
intensity = 255-intensity
setColor(p,makeColor(intensity ,intensity ,intensity))
```