1. A raster image processing method including a plurality of parameters having values to manipulate a set of content objects, each content object corresponding to an image, each image including regions therein, and each region including boundaries, the method comprising the steps of: determining distances between the boundaries of the regions corresponding to the images of the content objects; when a distance between two of the boundaries is smaller than 10 mm or if the regions touch or partially overlap each other, selecting the content objects corresponding to the images to which the regions belong; calculating a set of similarity values by applying a set of similarity methods to the selected content objects; comparing the set of similarity values with a set of threshold values to determine if the content objects are similar or not; and when it is determined that the content objects are similar, then performing raster image processing on each of the selected content objects of the set of content objects that share a value of at least one parameter to manipulate the selected content objects.