Printer calibration
Color calibration is based on the color measurement of printed color patches, using the HP Embedded Spectrophotometer. Some characterisitics of substrates, such as surface roughness or transparency, may make reflective color measurement of some substrate types very inaccurate. Color calibration of these substrates will fail or produce unacceptable printing results.
The suitability of particular substrate types for color calibration can be found in the table of supported substrate types in the User's guide. Only substrates wider than 36 inches (914 mm) can be calibrated.
It is possible to recover from a bad color calibration by restoring the factory default calibration. In the HP Internal Print Server, select Substrate > Color calibration > Reset.
You should calibrate a substrate type before creating its color profile; however, you can later recalibrate without needing to recreate the color profile.
Ink restrictions
Ink restrictions allow you to set the maximum amount of each primary ink (cyan, magenta, yellow, black, light cyan, light magenta) that can be laid down onto a given substrate.
To adjust ink restriction percentages from the HP Internal Print Server, select Substrate > Edit > Color.
Ink restriction percentages can be set from 50% to 100% for all inks by filling in the appropriate boxes. In general, a figure of about 80% is recommended.
High percentage settings (approaching 100%) use more ink and may therefore increase color gamut, at the cost of leaving less margin for the operation of the color calibration system, which may reduce color consistency.
Lower percentages use less ink, provide a smaller color gamut and a higher range of compensation for best color consistency.
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Color profiles
Color calibration provides consistent colors, but consistent colors are not necessarily accurate. For instance, if your printer prints all colors as black, its colors may be consistent but they are not accurate.
In order to print accurate colors, it is necessary to convert the color values in your files to the color values that will produce the correct colors from your printer, your inks and your substrate. An ICC color profile is a description of a printer, ink and substrate combination that contains all the information needed for these color conversions.
These color conversions are performed by your Raster Image Processor (RIP), not by the printer. For further information on the use of ICC profiles, see the documentation for your application software and for your RIP.
10 Chapter 3 Printer calibration | ENWW |