the pixels with the expanded regions will be determined by several mathematical algorithms such as liner or interpolation method or just being assigned simply with the colors of the pixels near the original triangle edges besides the raster device 1 u2032 of the present application starts the rasterizing of each triangle from the longest edge which is referred to as est in fig5 to the end of the edges which are referred to as eend 1 and eend 2 in fig5 the following equations 1 2 and 3 show the slope of est eend 1 and eend 2 respectively x st dx y 1 u2212 y 3 x 1 u2212 x 3 eq 1 x end1 dx y 1 u2212 y 2 x 1 u2212 x 2 eq 2 x end2 dx y 2 u2212 y 3 x 2 u2212 x 3 eq 3 as mentioned above the polygons to be processed are first decomposed as at least one triangle having est eend 1 and eend 2 as shown in fig5 in block 5 of fig2 the one parameter left to be determined is the mastering orientation for each of the at least one triangle the following is an example of program showing that how the x y.