RGB responses for the function spectrumRGB. Note the second lobe of the red response in the smaller wavelengths. This is due to the perception of such wavelengths as violet, represented in RGB as a combination of red and blue. The ccd image representation removes the contribution of this second lobe.
Boucheron et al. BMC Cell Biology 2007 8(Suppl 1):S8 doi:10.1186/1471-2121-8-S1-S8