1. A method of reducing a size of data representing an image in a graphical display wherein the data comprises triangle strings representing polygons that form the image, the method comprising: determining a size of a pixel in the image; selecting a triangle string that defines a first polygon, wherein the triangle string consists of a set of vertices; selecting a subset of vertices from the set of vertices; determining a second polygon from the subset of vertices; comparing the size of a pixel in the image to a dimension of the second polygon; determining a number of triangles in the triangle string; in response to the dimension of the second polygon being smaller than or about equal to the size of the pixel in the image, reducing the number of triangles in the triangle string to at least one of one triangle or two triangles; and in response to the dimension of the second polygon being larger than the size of the pixel in the image, leaving the number of triangles in the triangle string unchanged.