The Change Color Component tool lets you change one of the Red, Green, Blue, or Alpha (transparency) components of one of the Paint Layers of a path. Every color is defined by these three components. The top Option Button of the tool allows you to select which layer to operate on: Bottom, Middle, or Top. The next option button allows you to select which component (again: Red, Green, Blue, Alpha) to change. Here’s an example of how to use it:
This tool changes only color. The other attributes of the paint such as stroke width aren’t affected. If you’d like to change all the layers at once, use the Change Paint tool.