| 摘要 |
<p>A system and method for rendering ink annotations (1302, 1303) for a displayed image (1301) is disclosed. The invention renders annotations (1302, 1303) to mimic how physical ink would appear if similarly applied to physical paper. In one embodiment, the invention uses subtractive rendering to produce combinations of colors. Here, the system subtracts a complement of a color from an existing color to produce the rendered color. The rendered color is the color that is common to the annotation color and the existing color. This operation may be simplified as a binary ADD of the numeric representation of the two constituent colors. Using this invention, the resulting color shown at a given pixel P shows the history of all color layers at the pixel P, rather than merely the last applied color.</p> |
