Write a function called changeColor that takes as input a picture and an amount to increase or decrease a color by and a number 1 (for red), 2 (for green), or 3 (for blue). The amount will be a number between ?.99 and .99.

Question

What will be an ideal response?

Answer 1

```
def changeColor(picture, amount, number):
for p in getPixels(picture):
if number==1:
value = getRed(p)
value = value +value*amount
setRed(p,value)
if number ==2:
value = getGreen(p)
value = value +value*amount
setGreen(p,value)
if number ==3:
value = getBlue(p)
value = value +value*amount
setBlue(p,value)
```

Note: Because of the requirements of the question, unlike in the previous chapter the value variable can’t just be multiplied by the amount variable. If one did it that way, they’d end up with a image with ninety percent of the red removed with the function all “changeColor(pict,?.10,1)” and not the ten percent requested.