Yes you can easily do it. I use Paint Shop Pro software it is free to try sharware for 30 days. It is really easy. One way would be to open the image in the software. Then create a layer (like putting a piece of see-through plastic on it) and painting the layer with whichever color you like. You can vary the opacity of the layer with simple slide controls. Estimated time to do all this about 40 seconds. Paint Shop Pro 7 is a really good piece of software and beats many many others in performance per pound spent.