1. A method for non-linear image processing, comprising: reading an X-ray raw image from a pixel matrix; and converting the X-ray raw image to an X-ray image, wherein the pixel matrix contains pixel elements of a bit depth which is considerably less than the number of pixel elements, wherein a final value is determined for each raw value and is calculateable via a non-linear image processing algorithm, and wherein table values are called up and used at least in some cases for the determination of the final values, the table values being associated in a table with corresponding bit values, the maximum number of which is defined by the bit depth.