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