IR, or infrared, refers to wavelengths of light that are longer than approximately 720 nm and are invisible to the human eye. Infrared light can be recorded on specially sensitized films or digital sensors, producing unique black-and-white or colour images that reveal details not seen in visible light.
Understanding infrared photography is valuable for photographers interested in creative effects, scientific imaging, or landscape work. By capturing IR light, photographers can highlight foliage, enhance contrast, and create striking, surreal images that differ dramatically from standard visible-light photography.