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HP Designjet Printers - Printing in Grayscale

HP DesignJet 200,220,230,300,330,600 and 700 printers
If you use one of the above models for printing color information (content of the file) it will always convert the color information into grayscale.
This conversion always occurs through the printer.
Very thin lines could look like they were not plotted accurately.
HP Series 600 and 700 DesignJets are able to plot monochrome in best mode with a resolution of 600 dpi (dots per inch). This raster is used for placing the dots.
The size and the ink used for one dot is always the same. It is possible to plot grayscaled, therefore the printer is using a method which is called ‘Dithering‘. While printing grayscaled areas or lines the printer will leave some dots out.
The following pictures will let you see how dithering is working. Two different lines are shown with a different line width.
Keep in mind that these images are enlarged.
Each image shows the same line with a different scaling factor.
The first picture shows a continuous line. The other ones are visible as brighter and brighter black lines; you can see that these lines are build in a different way (dithering).
All color HP DesignJet printers
All other HP DesignJet printers are color printers. That means they use the colors either from software or from the internal pen palette setting.
It is possible to set the printer to print in monochrome mode through the front panel or software.
The printer will process the data sent like a monochrome printer (as described above).
All color information will then print as grayscale color. Due to the way grayscale color is displayed, lines could look frayed (See explanation above as to why that may happen).
This is not a quality issue, it just has to do with how the printer converts color to monochrome.
If you need black lines you should choose these setting either at the printer or from the software.

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