A device for color-dependent detection of image contents with a carrier medium, which is formed as a light guide for transferring coupled-in light, and a light coupling-in device, a measurement area and an outcoupling area, which are arranged in different sections of the carrier medium, wherein - the light coupling-in device includes a light source, wherein the light source is formed to radiate light with a first wavelength, and wherein the light coupling-in device is arranged and formed to couple light with the first wavelength into the carrier medium; - the carrier medium is formed to transfer the coupled-in light from the light coupling-in device to the measurement area by means of internal reflection; - the measurement area is formed as a holographic element with a first diffraction structure, which is adapted to couple coupled-in light with the first wavelength, which is incident on the first diffraction structure, out of the carrier medium and to couple light with the first wavelength, which is incident on the first diffraction structure from outside of the carrier medium, into the carrier medium towards the outcoupling area, wherein the first diffraction structure is further formed as a multiplex diffraction structure, which is adapted to additionally couple in light in a second wavelength range, which is incident on the first diffraction structure from outside of the carrier medium, towards the outcoupling area; - the outcoupling area is formed as a holographic element with a second diffraction structure, which is formed as a multiplex diffraction structure and is adapted to couple light of the first wavelength and light of the second wavelength range, which is incident on the second diffraction structure from the direction of the measurement area, out of the carrier medium onto a camera device; wherein the camera device is formed to capture the light coupled out onto the camera device and to provide it in the form of image data, which correlates with the captured light, characterized in that the device further comprises an identification device, which is formed to receive the image data of the camera device and to examine the image data for a preset biometric identification feature, and to generate a control signal upon occurrence of a predetermined comparison condition. - the light coupling-in device includes a light source, wherein the light source is formed to radiate light with a first wavelength, and wherein the light coupling-in device is arranged and formed to couple light with the first wavelength into the carrier medium; - the carrier medium is formed to transfer the coupled-in light from the light coupling-in device to the measurement area by means of internal reflection; - the measurement area is formed as a holographic element with a first diffraction structure, which is adapted to couple coupled-in light with the first wavelength, which is incident on the first diffraction structure, out of the carrier medium and to couple light with the first wavelength, which is incident on the first diffraction structure from outside of the carrier medium, into the carrier medium towards the outcoupling area, wherein the first diffraction structure is further formed as a multiplex diffraction structure, which is adapted to additionally couple in light in a second wavelength range, which is incident on the first diffraction structure from outside of the carrier medium, towards the outcoupling area; - the outcoupling area is formed as a holographic element with a second diffraction structure, which is formed as a multiplex diffraction structure and is adapted to couple light of the first wavelength and light of the second wavelength range, which is incident on the second diffraction structure from the direction of the measurement area, out of the carrier medium onto a camera device; wherein the camera device is formed to capture the light coupled out onto the camera device and to provide it in the form of image data, which correlates with the captured light, characterized in that the device further comprises an identification device, which is formed to receive the image data of the camera device and to examine the image data for a preset biometric identification feature, and to generate a control signal upon occurrence of a predetermined comparison condition.