I did it like this.
Menu: Tools: Selection Tools, By Color Select.
In the left side Tool Options box.
Mode: add to the selection.
Threshold: Around 75
Clicked over the darker blue.
Click again over the lighter blue part that wasn't selected.
Menu: Colors, Hue Saturation.
- HairColor.png (74.01 KiB) Viewed 3773 times
I've seen only one color altered easier but can not remember how it was done.
You better wait for the gurus to reply.