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2 One plot is Relative responsivity, and the other is Quantum Efficiency, they are different.
Relative responsivity is an estimate of the number of photoelectrons that are generated by a unit of radiant energy.
When thinking in terms of QE, we consider photons as the input and photoelectrons as the output of an image sensor. In this context, a “red” photon as no different from, let’s say, a “green” photon. We are concerned only with the probability that photons of different wavelengths are converted into photoelectrons. This probability is represented as a percentage, which we specify as the QE at that particular wavelength.
When thinking in radiometric terms however, we consider luminous energy to be the input, and electrons (or amperes, or even camera values output as Analog-to-Digital Units) as the output. It is now significant to note that the energy that is associated with a “red” photon is lower than the energy associated with a “green” photon.