You will probably have to do this one for each unattached section of the gunshight you choose. In photoshop, use the magic wand to highlight the areas with the same color. Then, go to the color selector, and double click until the pallet comes up. Select a color (one that will ocntrast with all sky and ground colors). then click that color. It should be the top square in you color indicator. Then, click on the paint bucket and when yhou click in the highlighted area, it will change to the color you selected. Repeat as needed for unconnected area.
That's the way I do it, other's might know better and faster ways.
GL
