The invention relates to an apparatus for processing images by means of a series of user interactions. When processing an image, the user follows a series of interactions. Preferably, this is standardized to ensure reproducibility and accuracy. However, the series of interactions required from the user may be dependent on the needs of the user, the image being processed or even on the preferences of the user. The invention provides an apparatus which can deal with complex image processing requirements, providing both a standardized series of steps, or trail, in the image visualization process, and allowing the user to deviate from this standard trail if required. This accelerates and simplifies the interaction necessary when the user performs a known task on a different image. It also provides valuable assistance when the user performs an unfamiliar task, thereby avoiding mistakes, such as incorrect radiation levels during image acquisition, which can have serious consequences in a medical imaging environment.