| 摘要 |
A method (500) of creating an image is disclosed. The image (e.g. 200) is formed by rendering a plurality of graphical objects (e.g. 203, 204, 205) on a scanline (e.g. 301) basis, where each scanline (301) comprises at least one run of pixels (e.g. 325). The method (500) forms an array representing the graphical objects (203, 204, 205) of the image (500). The array is sorted in an order from a top-most graphical object to a bottom-most graphical object. For each scanline (301) of the image (200) and for each run of pixels (325) of the scanline (301), the array is traversed to determine objects (203, 204, 205) contributing to the run of pixels (325). If a top-most contributing object is fully opaque, then data associated with the fully opaque object is halftoned to generate the run of pixels (325). Otherwise data associated with one or more of the contributing objects is composited and the composited data is halftoned to generate the run of pixels (325). <IMAGE> |
