HP Scitex LX850 HP Scitex LX850 & LX820 Printers: Maintenance and troubles - Page 21
Ink restrictions, Default, Obsolete, Substrate, Color calibration, Reset, Color
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Printer calibration ● Default status indicates that the substrate has never been calibrated. In this case, the factory default color tables will be applied to print jobs. ● Done status indicates that a color calibration has been performed successfully on this substrate. ● Obsolete status indicates that a printhead has been changed since the substrate was last calibrated, and therefore the substrate should be recalibrated. Color calibration is based on the color measurement of printed color patches, using the HP Embedded Spectrophotometer. Some characteristics 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 914 mm (36 in) 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. NOTE: Ill-defined ink restrictions may lead to unpredictable results. You can restore the default ink restriction settings by selecting Substrate > Edit > Color > Reset. ENWW Ink restrictions 15