Use of spectral sensitivity variability in reflectance recovery from colorimetric information.There have been numerous methods for accessing the reflectance spectra; some methods enable one to obtain the spectra directly, such as using a spectrophotometer, hyper-spectral camera, and so forth. 
spectrophotometer
Use of spectral sensitivity variability in reflectance recovery from colorimetric information.There have been numerous methods for accessing the reflectance spectra; some methods enable one to obtain the spectra directly, such as using a spectrophotometer, hyper-spectral camera, and so forth. 
hyper-spectral camera