What is multispectral image?
“Multispectral” is an ill-defined term in imaging. In general it refers to an image that has more than 3 channels (which are typically RGB) sampling the visible spectrum (and it could extend to other wavelengths as well). When the image is sampled a relatively fine increments through the spectrum (say 20nm or less) with a bandpass equal to the sampling increment, that can be referred to as simply a “spectral image” (just like we talk about spectral reflectance or spectral power distributions).
