1. A method of adjusting an image parameter of an X-ray image, comprising: displaying a virtual user interface on a screen; displaying a setting range of the image parameter, the setting range having at least a first and a second range subset, the subset ranges including different coloring, the first subset representing a recommended parameter setting range and the second subset representing a non recommended parameter setting range; and displaying a current parameter setting of the image parameter relative to the parameter setting range, on the user interface; wherein the image parameter is related to an element of the group consisting of an X-ray dose, a X-ray tube voltage, an X-ray tube current, an electrical power, a distance between an X-ray emitter and a patient to be examined, a distance between an X-ray emitter and an X-ray detector, an X-ray pre-filtering and an X-ray exposure time wherein a plurality of image parameters is displayed in parallel; wherein a limit value of the range subsets of the parameter setting ranges of a first of the image parameters is calculated using the current parameter setting of a second of the image parameters; wherein one of the range subsets of the parameter setting ranges of said first of the image parameters is calculated using the current parameter setting of said second of the image parameters; and wherein the current parameter setting of said first of the image parameters is adjusted by the current setting of said second of the image parameters.