1. A process for registering a fluorescence image and a reflectance image comprising: acquiring a fluorescence image; simultaneously embedding an embedded reflectance image in said fluorescence image whereby an embedded reflectance image is embedded in said fluorescence image; acquiring a separate reflectance image; comparing said embedded reflectance image and said separate reflectance image to select common features; transforming at least one of said reflectance images to register said common features between said reflectance images; whereby said fluorescence image and said separate reflectance image are registered.