An endoscope system comprising: a light source comprising a first light device for emitting light in the red wavelength spectrum, a second light device for emitting light in the blue wavelength spectrum, a third light device for emitting light in the green wavelength spectrum, and a fourth light device for emitting infrared light, and a switch arrangement for allowing a user to manually switch between a first mode and a second mode, the switch arrangement switching the light source between the first mode and the second mode, wherein in the first mode light in the red wavelength spectrum, light in the green wavelength spectrum and light in the blue wavelength spectrum are emitted and light in the infrared wavelength spectrum is not emitted, and in the second mode light in the infrared wavelength spectrum, light in the green wavelength spectrum and light in the blue wavelength spectrum are emitted and light in the red wavelength spectrum is not emitted; an endoscope in communication with the light source, the endoscope being capable of receiving light from the light source and emitting the light onto a patient site and receiving reflected light and emitted fluorescent light from the patient site and transmitting the received light; a receiving device in communication with the endoscope and comprising a splitting filter capable of splitting a light mixture into separate wavelength rays, a first image sensor capable of detecting light in a green wavelength spectrum and converting the green light to a first image signal, a second image sensor capable of detecting light in a blue wavelength spectrum and converting the blue light to a second image signal, and a third image sensor capable of detecting light in a red wavelength spectrum and in an infrared wavelength spectrum and converting the red light and infrared light to a third image signal; and a processor in electronic communication with the receiving device and disposed to receive the first image signal, the second image signal, and the third image signal, to process the signals to create a display signal to be sent to a display apparatus, wherein the processor is arranged for being switched between the first mode and the second mode by use of the switch arrangement, and wherein the processor is arranged to, in the first mode provide an image in full color and characterized in that the processor is further arranged to, in the second mode, convert the first and second image signals into a black and white image and processing and sending the third image signal to a visible pseudo color output. a light source comprising a first light device for emitting light in the red wavelength spectrum, a second light device for emitting light in the blue wavelength spectrum, a third light device for emitting light in the green wavelength spectrum, and a fourth light device for emitting infrared light, and a switch arrangement for allowing a user to manually switch between a first mode and a second mode, the switch arrangement switching the light source between the first mode and the second mode, wherein in the first mode light in the red wavelength spectrum, light in the green wavelength spectrum and light in the blue wavelength spectrum are emitted and light in the infrared wavelength spectrum is not emitted, and in the second mode light in the infrared wavelength spectrum, light in the green wavelength spectrum and light in the blue wavelength spectrum are emitted and light in the red wavelength spectrum is not emitted; an endoscope in communication with the light source, the endoscope being capable of receiving light from the light source and emitting the light onto a patient site and receiving reflected light and emitted fluorescent light from the patient site and transmitting the received light; a receiving device in communication with the endoscope and comprising a splitting filter capable of splitting a light mixture into separate wavelength rays, a first image sensor capable of detecting light in a green wavelength spectrum and converting the green light to a first image signal, a second image sensor capable of detecting light in a blue wavelength spectrum and converting the blue light to a second image signal, and a third image sensor capable of detecting light in a red wavelength spectrum and in an infrared wavelength spectrum and converting the red light and infrared light to a third image signal; and a processor in electronic communication with the receiving device and disposed to receive the first image signal, the second image signal, and the third image signal, to process the signals to create a display signal to be sent to a display apparatus, wherein the processor is arranged for being switched between the first mode and the second mode by use of the switch arrangement, and wherein the processor is arranged to, in the first mode provide an image in full color and characterized in that the processor is further arranged to, in the second mode, convert the first and second image signals into a black and white image and processing and sending the third image signal to a visible pseudo color output.