Abstract: A system for adding transparency to an object based rasterized image includes comparing edge information with a pixel position on a scan line in order to determine the active objects on the scan line based on level information and determining a highest active opaque object level and a highest active transparent object level. According to the present invention, whenever the highest active opaque object level and the highest active transparent object level intersect at one pixel location, the higher of the two levels is output.

Abstract: Method and apparatus for color printing according to a printer table having high color smoothness for out-of-gamut colors. A color printer gamut edge is first determined and color primary values for colors within the printer gamut are calculated and inserted into the printer table. For transition colors, namely those colors outside the printer gamut edge but still within the printer table, color primary values are calculated by selecting a color from the printer gamut edge at a point which lies at a constant angle from the transition color in question. The same constant angle is used for each and every one of the transition colors. A border table is provided for colors outside of the printer table; the color primary values for the border table are selected in the same manner as for the transition colors.