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.

• ChangeColor(pict,−.10,1) should decrease the amount of red in the picture by 10%.
• ChangeColor(pict,.30,2) should increase the amount of green in the picture by 30%.
• ChangeRed(pict,0,3) should do nothing at all to the amount of blue (or red or green) in the picture.