Method and control device for determining photometric parameters of a projectable character

The photometric parameters (such as light density or colour distribution) of a character which can be projected in front of a screen of a vehicle, can be ascertained by receiving 100 via an interface an item of information relating to photometric parameters in an area surrounding the vehicle, determining 103 an angular range of the surrounding area, in front of which the character appears for an occupant, determining 105 photometric parameters in the angular range, based upon the information relating to photometric parameters in the area surrounding the vehicle, and determining 108, 113 at least one photometric parameter of the character which is adapted to the photometric parameters in the angular range. A control signal may be used to change the photometric parameters to aid visibility of the character.