The invention provides a system and method for analyzing light reflection and absorption to alter targeted surfaces while preserving surrounding areas. The system utilizes a tunable light emitter and a spectroscopic analyzer to identify wavelengths that are absorbed by the target but reflected by the background. The light emitter is then tuned to transmit those specific wavelengths, inducing a photo-thermal reaction in the target. This allows for precise surface alterations, such as cleaning or removal of specific materials, without affecting adjacent areas. Applications include medical procedures, industrial processing, and surface cleaning.