| 摘要 |
<p>A shingle mask has width mismatched to maximum-eye-sensitivity spatial frequency at reading distance or closer, so the mask is tiled with minimal patterning. A second invention facet forms a grid of optimum width - it corresponds to maximum sensitivity only if seen from much farther than reading distance. A third facet forms a 2D mask with width 0.25 to 2 inches, better 0.375 to 1.5, ideally 0.5 to 1 (progressively further from maximum sensitivity; as further increases help little, this enables bandfree printing without very large masks). A fourth facet optimizes width in terms of distance in the image, for aesthetics, speed and economy. Another facet automatically forms a mask that time-varies nozzle-use modulation. Another prints nontext images by a multinozzle pen, modulating use; still others by plural pens each with a multinozzle array, refraining from use of certain nozzles e.g. to simulate dynamic pen staggering. <IMAGE></p> |
