1. A method of rendering graphical objects on a page, the method comprising: marking a region of the page containing a graphical object as output incompatible based on the graphical object being output incompatible; determining a bounding box comprising the marked region and at least one output compatible region, the output compatible region containing at least a portion of an output compatible graphical object; determining a proportion of a number of the regions marked as output incompatible to a total number of regions in the bounding box; marking said at least one output compatible region within the bounding box as output incompatible if the determined proportion is above a threshold; converting the graphical objects in the marked output incompatible region into an output compatible graphical object; and rendering the output compatible graphical object.