Three spectral sensitivity functions were compared in order to determine the best method to extract color images from hyperspectral images. The first method, assuming the synthetic unit-impulse functions for a camera’s spectral sensitivities, was to use three spectral band images obtained at three discrete wavelengths, 455, 535, and 610 nm for blue, green, and red color channels, respectively. The second method, assuming the synthetic rectangular functions for the sensitivities, was to use three spectral ranges of nonoverlapping wavelengths at 435 to 485 (blue), 505 to 575 (green), and 595 to 660 (red) nm. Average reflectance values computed in each wavelength range were assigned to the corresponding RGB values. The third method, which was more practical, was to use the spectral sensitivities of a CCD sensor (ICX445AQ, Sony Corp.) used in a commercial RGB color camera (Prosilica GC1290C, Allied Vision Technologies GmbH, Stadtroda, Germany), whose spectral sensitivities are shown in Fig. 3. The RGB values computed by Eq. (1) were converted to unsigned 16 bits.