In a method and a device MR images having various contrasts are scanned and then values for some or all of the parameters T1, T2 and PD related to the scanned MR images are determined. Based on the scanned MR images and the determined parameter values an initial conventional MR contrast image with some default scanner settings is generated, or alternatively, a stronger non-physical MR contrast image. The initial MR contrast image can then be manipulated by a user in response to movement of a user-controlled marker on a screen showing the contrast image such that a contrast optimized image can be obtained for a particular diagnosis in a very short time. Furthermore a quantitative image can be generated representing the amount of a single tissue type.