Calibration
Calibration is a very important color tone adjustment task among the daily color management.
There are two types of calibration, regular and advanced.
Regular Calibration
Regular calibration corrects color tones by measuring the density of primary colors (CMYK) currently being output. The measurements are then used to create calibration data. The color tones are corrected based on the data, without creating a new profile.
There are two methods for regular calibration of the main body:
Calibration in color management on the main body by using the density sensor in Relay Unit RU-511 (Color Density Control)
Controller calibration, through Color Centro color management, using a colorimeter
Advanced Calibration
Advanced calibration provides a method to easily correct color tones, without the need to create a new profile as was necessary in previous machines, and without having to adjust the density of primary colors (CMYK).
There are two methods for advanced calibration:
Exact Color
G7 calibration
Exact Color corrects profiles.
It corrects reproduction of mixed colors of CMYK as well as that of each color of CMYK.
Therefore, it can achieve higher accuracy than regular calibration can.
Use Exact Color in any of the following cases:
When you want to improve the accuracy of a standard profile
When you want to eliminate the gap between machines if you have more than one of this machine
G7 calibration treats each color of CMYK as a one-dimensional curve. And then, G7 calibration realizes consistent gray reproduction in any printing method.
G7 calibration is a calibration method that IDEAlliance® develops to control gray balance.
In Color Centro, Exact Color is configured as default.
You can use only either Exact Color or G7 calibration.
To switch to G7 calibration, contact your service representative.
Notes when you switch to G7 calibration:
You cannot use profiles and conversion tables (LUT) that you created by using Exact Color.
The following profiles and tables are not automatically deleted from the image controller.
To delete them, delete them manually.Customized profiles that are registered before you switch
Conversion tables (LUT) that are registered before you switch
After you specified profiles appropriately, execute RIP (color conversion) again on hold jobs that are saved before you switch. After you switch, check hold jobs.
Choice of an Appropriate Calibration Method
In order to ensure accurate and stable colors, perform regular calibration routinely. For routine calibration, we recommend using color management calibration (output density adjustment) on the main unit, which automatically creates calibration data.
Use advanced calibration to correct inaccurate color tones caused by changes in the machine's physical environment (temperature, humidity), or to ensure different machines produce the same color tones.
If you use the controller calibration of Color Centro, you can print a chart for measurement, measure the chart by using a colorimeter, create calibration data, and register the calibration data in the image controller.
For each screen type, you can create calibration data for a paper type.
To keep accurate and stable color printing, register calibration data that is appropriate to the condition of this machine and environment.
The most recent calibration data saved on the image controller is applied to the following print jobs when printing.
- General print jobs
- Print jobs saved in the image controller area of the hard disk
- Print jobs saved in the main body area of the hard disk
For details, refer to Calibration Manager Screen and Operate on the Calibration Manager Screen.