Changing colors on static image
<p>Is there a way to change the color of each state on a static image of the USA? My goal is to use state health rankings to color code a map of the USA, to show the overall 'healthiness' of each state. At first I thought I could just change the opacity of each state, but all the states are combined in one image. Then I thought of narrowing it down by coordinates, but that seems really messy and wouldn't be the same on different screen sizes. 
Is there any way I can do this?</p>
