A regular printer calibration ensures a consistent and accurate representation of colours.
Calibration is changing a devices behaviour to achieve desired state and consistency. The purpose of a printer calibration is to match the given target values as closely as possible, within certain tolerances. Calibrating the printer(s) regularly ensures production stability and a consistent, accurate representation of colours.
The smaller the tolerances, the closer you get to the target values, but also the more often you have to calibrate the printer.
We recommend using the following tolerances which are tighter than the default:
CMY Max 3.5
CMY Avg 0.8
K Max 1.5
K Avg 0.6
We are unable to provide support for systems using tighter tolerances than the above.
If no valid calibration file is available, the printer shifts into status 'Not Calibrated' and all jobs are put on hold until the printer is calibrated again.
Calibrations last for 7 days. Once this time limit has been reached the printer will need to be calibrated again.
An orange warning will display beside a calibration set when a printer is not calibrated.
How to Calibrate
Check all inks are in-date and then gently shake all inks for about 15 seconds before placing them back into the printer.
Print a nozzle pattern via the printers control panel or via the Output Tab in ColorProof.
If the nozzle pattern shows breakages in the lines then a nozzle is blocked and will need to be cleaned. This can be done via the Output Tab in ColorProof or via the printers control panel.
If the nozzle pattern shows no breakages select the calibration set you would like to calibrate.
Click either Auto-Cali when using an inbuilt spectros or Cali Wizard when using another measuring device. (These buttons can be found to the right of the calibration sets in the Output Tab.)
If the printer is using 10 colours a pre-linearisation chart printed and measured twice.
Once the pre-linearisation has been successful, the main calibration chart will then be printed and will need to be measured, either manually or automatically with the inbuilt Spectro.
Auto-Calibration will re-iterate up to a maximum of 5 times to try and come within the tolerances defined by ColorProof. ColorProof will display the results of each iteration and once passed the printer will be calibrated and ready to print.
If a printer takes more than 5 iterations to come down within tolerances it could mean something is wrong and needs to be checked. Check out our knowledge base article on high deltaE readings for troubleshooting steps.