What does spectral resolution mean?
Spectral resolution is defined as the number and width (wavelength) of bands (meaningful portions) of electromagnetic energy detectable by a given sensor. For analog photography, it is defined as the number of emulsion layers in the photographic film (i.e., one for black/white photographs and three for color). Spectral resolution is limited to the visible and low end of the near infrared portion of the EMS for photographic film, which is limited by photochemical processes. However, spectral resolution can range from one to hundreds of channels in a digital sensor, from the upper end of the ultraviolet light to the thermal infrared for optical sensors.
