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How do I perform a Close Loop Color Calibration?

 

Why perform regular calibration?

To ensure that the output quality remains constant and that the individual output devices produce comparable results, the HP Designjet 50ps printer must be calibrated at regular intervals (recommended: once a week) by using the Close Loop Color Calibration function (automatic calibration). During calibration, a page with a test pattern is output to the proofer.

Note: A calibration cannot be carried out for some of the paper types and print qualities. For a more detailed explanation, refer to the HP Designjet 50ps EngineManager online help on the server.

 

Calibration procedure

During the calibration process, a page containing a test pattern is output on the printer. The ink is allowed to dry for a short time, and then the page is fed back into the printer and analyzed. For this analysis, the printer has been fitted with a densitometer which measures the color density. The resulting linearization curve is then used for uniform screening.

Note: This curve is only used for density correction and not for color correction. For color correction, suitable profiles must be calculated using spectrophotometers and the appropriate programs.

This calibration is added to the system as a separate job, in other words, when the calibration process is started for the paper type selected, the job currently being printed is completed but the next job in the queue is paused until calibration is finished. This can take between approximately 5 and 7 minutes due to the ink drying. The waiting job is then processed without any user inputs.

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Starting calibration

Calibration is started with a separate program, the HP Designjet 50ps EngineManager. It is automatically installed on the server during installation and can be launched by selecting Start > Programs > hp Designjet 50ps > hp Designjet 50ps EngineManager. You can find more information in the Online Help of this program.

Note: This program can only run if Java™ RuntimeEnvironment 1.3 is installed. This is automatically set up on the server during the installation of the HP Designjet 50ps software. You cannot simply launch this program from the clients.

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