| 摘要 |
In a hybrid multi-drop and multi-pass printing system, composite drops are formed from separate drops merging onto media and highlight regions are formed by using single drops to form a dot. Individual drops are nearly invisible and thus can form highlights with low graininess. As the density of the image increases, multi-drop dots are formed by merging two or more drops. Drops merging together on the media cover white space more efficiently, increase optical density without throughput loss and reduce ink ejection frequency. Multiple passes result in error hiding and improved ink/media interaction. An array of ink ejection elements forms a single printhead in a carriage which is passed along a scan axis perpendicular to the media in the advance direction so that the array path defines a swath area on the media surface. The ink ejection elements are energized during the initial passing step. Subsequent passages of the carriage along the carriage scan axis and energization of the ink ejection elements cause a predetermined number of ink droplets to be ejected onto the media surface at predetermined individual pixel locations.
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