a method for the rectification of an x - ray picture of an item of luggage during luggage screening with the following steps : recording the x - ray picture of the item of luggage by means of a x - ray radioscopy device ; geometric rescaling of the x - ray picture whilst taking into consideration only the geometric data of the mapping geometry of the x - ray radioscopy device and also the image data of the recording of the x - ray picture of the item of luggage , the beam path being tracked for each detector element onto a respective preset plane ; transmission of the rescaled , de - skewed x - ray picture to a display or image - processing apparatus .