A spectral sensor for acquiring spectral information of an object, said spectral sensor comprising an array of photo-sensitive areas (3a-i) forming pixels, a first type of interference filter comprising at least two reflective multilayers of a first type, wherein the multilayers are separated by an intermediate layer configured to give a constructive interference for a wavelength in a first wavelength range; a second type of interference filter comprising at least two reflective multilayers of a second type, the second type being different from the first type, wherein the multilayers are separated by an intermediate layer configured to give a constructive interference for a wavelength in a second wavelength range other than the first wavelength range; a first type of filter stack configured to selectively transmit light in the first wavelength range to a first photo-sensitive area, the first type of filter stack comprising the first type of interference filter and a second type of dielectric mirror, wherein the second type of dielectric mirror is reflective in the second wavelength range and comprises at least two reflective multilayers of the second type separated by an intermediate layer configured to give a destructive interference in transmission for a wavelength in the second wavelength range, a second type of filter stack configured to selectively transmit light in the second wavelength range to a second photo-sensitive area, the second type of filter stack comprising the second type of interference filter and a first type of dielectric mirror, wherein the first type of dielectric mirror is reflective in the first wavelength range and comprises at least two multilayers of the first type separated by an intermediate layer configured to give a destructive interference in transmission for a wavelength in the first wavelength range; wherein the at least two reflective multilayers of the first type are arranged below the at least two reflective multilayers of the second type, in both the first type of filter stack and the second type of filter stack. an array of photo-sensitive areas (3a-i) forming pixels, a first type of interference filter comprising at least two reflective multilayers of a first type, wherein the multilayers are separated by an intermediate layer configured to give a constructive interference for a wavelength in a first wavelength range; a second type of interference filter comprising at least two reflective multilayers of a second type, the second type being different from the first type, wherein the multilayers are separated by an intermediate layer configured to give a constructive interference for a wavelength in a second wavelength range other than the first wavelength range; a first type of filter stack configured to selectively transmit light in the first wavelength range to a first photo-sensitive area, the first type of filter stack comprising the first type of interference filter and a second type of dielectric mirror, wherein the second type of dielectric mirror is reflective in the second wavelength range and comprises at least two reflective multilayers of the second type separated by an intermediate layer configured to give a destructive interference in transmission for a wavelength in the second wavelength range, a second type of filter stack configured to selectively transmit light in the second wavelength range to a second photo-sensitive area, the second type of filter stack comprising the second type of interference filter and a first type of dielectric mirror, wherein the first type of dielectric mirror is reflective in the first wavelength range and comprises at least two multilayers of the first type separated by an intermediate layer configured to give a destructive interference in transmission for a wavelength in the first wavelength range; wherein the at least two reflective multilayers of the first type are arranged below the at least two reflective multilayers of the second type, in both the first type of filter stack and the second type of filter stack.