An integrated photodetecting semiconductor optoelectronic component for measuring the intensity (I1, 12) of each of the two colour constituents (C1, C2) of dichromatic light irradiating the optoelectronic component, the component comprising: - a first SPAD adapted to detect photons over a broad range of wavelengths, the first SPAD comprising an active surface area allowing photons to be detected to enter the first SPAD; - a second SPAD adapted to detect photons over a broad range of wavelengths, the second SPAD being arranged next to the first SPAD; - a semiconductor optical longpass filter that at least partially covers the active surface area of the first SPAD, the longpass filter being permissive to a first one of the two colour constituents of the dichromatic light and blocking the second one of the two colour constituents of the dichromatic light; - electronic circuitry for the readout and processing of the detection signals (S1, S2) delivered by the first and second SPAD, the electronic circuitry being adapted to provide: i) a first intensity output signal I1 indicative of the intensity of the first colour constituent, based on the detection signal delivered by the first SPAD; and ii) a second intensity output signal I2 indicative of the intensity of the second colour constituent, via a differential analysis based on the detection signals (S1, S2) delivered by the first and second SPAD; wherein the differential analysis carried out by the electronic circuitry to provide the second intensity output signal I2 comprises the steps of: - determining a first photon detection rate N1 from the output signal delivered by the first SPAD; - determining a second photon detection rate N2 from the output signal delivered by the second SPAD; and - calculating the second intensity output signal I2 with the following formula: I 2 = a × N 2 − b × N 1 wherein a and b are constants, which are predetermined by the photon detection efficiencies of the first and second SPAD at the wavelengths corresponding to the two colour constituents. - a first SPAD adapted to detect photons over a broad range of wavelengths, the first SPAD comprising an active surface area allowing photons to be detected to enter the first SPAD; - a second SPAD adapted to detect photons over a broad range of wavelengths, the second SPAD being arranged next to the first SPAD; - a semiconductor optical longpass filter that at least partially covers the active surface area of the first SPAD, the longpass filter being permissive to a first one of the two colour constituents of the dichromatic light and blocking the second one of the two colour constituents of the dichromatic light; - electronic circuitry for the readout and processing of the detection signals (S1, S2) delivered by the first and second SPAD, the electronic circuitry being adapted to provide: i) a first intensity output signal I1 indicative of the intensity of the first colour constituent, based on the detection signal delivered by the first SPAD; and ii) a second intensity output signal I2 indicative of the intensity of the second colour constituent, via a differential analysis based on the detection signals (S1, S2) delivered by the first and second SPAD; i) a first intensity output signal I1 indicative of the intensity of the first colour constituent, based on the detection signal delivered by the first SPAD; and ii) a second intensity output signal I2 indicative of the intensity of the second colour constituent, via a differential analysis based on the detection signals (S1, S2) delivered by the first and second SPAD; - determining a first photon detection rate N1 from the output signal delivered by the first SPAD; - determining a second photon detection rate N2 from the output signal delivered by the second SPAD; and - calculating the second intensity output signal I2 with the following formula: I 2 = a × N 2 − b × N 1 wherein a and b are constants, which are predetermined by the photon detection efficiencies of the first and second SPAD at the wavelengths corresponding to the two colour constituents.