part 1
rgb1=(a1,b1,1c)
rgb2=(a2,b2,c2)
//rgb multiply

newColor=rgb1*rgb2/255

part2

rgb1=(a1,b1,1c) ,num1=8
rgb2=(a2,b2,c2),num2=3
//rgb multiply

newColor=(rgb1^num1) *( rgb2^num2 )/(255^(num1+num2))