How do I change my current hair color without damaging it more?

I currently have a dark brown/black hair color but the roots are reddish because of how the dye affected my natural hair color.



The roots look really bad, but I'd prefer not to do it dark again. Any general suggestions?......



Like, if I do it light brown, how do I keep my whole head looking uniform?
How do I change my current hair color without damaging it more?
Anytime you go lighter (or use a haordye that has to be mixed) you are doing damage....sucks I know
How do I change my current hair color without damaging it more?
How to Pick the Right Hair Color based on your hair color and undertone to avoid color failure

http://geebal.blogspot.com/2007/10/how-t鈥?/a>