Dot Size
Each dot produced by a 3006dpi cartridge has a diameter of 0.0055 in. The dot size must be larger than 1/300th of an inch (0.0033 in.) so that when a single6dot6wide line is printed, dots overlap and the line appears to be continuous.
Too Much Ink
A 6006dpi grid contains four times as many dots as a 3006dpi grid. This means that four times as much ink can be laid down on a 6006dpi grid. Media cannot absorb that much ink effectively; it puddles, runs, and dries slowly.
Dot Depletion To solve the ink problem, sophisticated algorithms produce asymmetrical dot arrangements to selectively reduce (deplete) the number of dots placed on the addressable 6006dpi grid in enhanced mode. (The same happens on the 3006dpi grid in draft mode, but to increase plotting speed.) Dot size is not varied in any of the print modes.
Print Quality
Draft mode is fast and uses half the ink of true 3006dpi resolution. Special algorithms control dot placement, creating a virtual 3006dpi image, rather than skipping every other dot. The image appears considerably lighter than the true 3006dpi print quality.
Final mode uses true 3006dpi resolution. Plotters set to plot on a 300x3006dpi grid directly map 90,000 raster image dots per square inch to 90,000 drops of ink.
Enhanced mode (on the DesignJet 220) uses addressable 6006dpi resolution. This involves 3006dpi cartridges on a 600x6006dpi grid. Dot depletion results in the same amount of drops used as in true 3006dpi mode. Print quality improves because the dot centers may be located anywhere on the 6006dpi grid. This results in smoother curves, straighter low6angle lines, smooth6edged area fills and easily readable small text.
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