Hover color the header

Hello, I have a question about how to make the header color change when I hover over the title. The header is actually an image. I think I can only hover text. Is there any way that I can make parts of the header image into text and then make that text change color when I hover over it? Or can i make only words on the header image hover? My website is: http://thepioneer.gatech.edu/ Thank you so much for your time and help, Sara