1. A method for computerized processing of an x-ray image, comprising the steps of: supplying electronic data to a computerized processor representing an x-ray image that contains blurring caused by a projection direction-dependent, effective optical focal size of an optical focus of an x-ray tube used to acquire the x-ray image; and in said computerized processor, automatically implementing a mathematical correction of said x-ray image to at least partially remove said blurring.