A frame-sequential multiwavelength imaging system comprises a wavelength switching device for producing a repeated series of different wavelength profiles, a detector for detecting the dynamic scene and a signal processing unit for synthesizing a dynamic multiwavelength image of the dynamic scene. The signal processing unit may comprise at least one input device at least one logic device and at least one output device. The system can be used in a method to perform multiwavelength imaging of a dynamic scene, typically for surgical purposes.