Field tone and gray balance control via 528/530
Overview
This document describes how to use X-Rite 528 or 530 instruments that use the principles of GRACoL promotion and adopt the G7 method to help users achieve the printing effect of the ISO standard. The X-Rite 528 and 530 spectrodensitometers are pre-configured according to the neutral gray density reference value specified in the G7 specification when shipped from the factory. For customers using earlier 528 or 530 instruments, the required data set can be downloaded free of charge from xrite.com, but in this case, the customer needs to perform some manual configuration. For more information, see the following in this article.
The G7 process control method is not described in this document. For more information on G7 guidelines and G7 definitions, please refer to the G7 specification on IDEAlliance (www.G7Global.org).
G7 measurement tool recommendation G7 recommends the use of spectrophotometer or spectrodensitometer to measure printed sheets and printed matter. X-Rite 528 and 530 color handheld spectrodensitometers can be perfectly used in G7 workflow.
G7 Data File X-Rite is pleased to be able to provide data files containing G7 solid tone and gray balance reference values ​​for the 528 and 530 instruments. The X-Rite 528 and 530 instruments are pre-configured with data files at the factory. You can also manually load the data files into the earlier version of the instrument for offline inspection.
The G7 field ink reference data for the 528 and 530 instruments represents the G7 L * a * b * standard for the following parameters: D50 / 2 °, unpolarized, and white backing.
Data files and terminology
G7 Guidelines for Field Ink Control
The G7 reference value can be loaded into the 528 or 530 instrument. If the reference value is lost and needs to be manually loaded into the device again, you can use the ColorMail Express software that comes with all X-Rite 528 and 530 instruments to perform this operation, which is located in the "500 Series Manual and Utilities "on the CD. The CD also includes files containing G7 reference values. [next]
528 and 530 instrument navigation-basic key operation
There are five keys on the display for menu and option navigation. Each key has a unique symbol indicating the specific operation to be performed:
Use G7 data in 528/530 "match" mode (please refer to the "match" function in the "X-Rite 500 Series Operating Manual"):
1. Select the "Matching" mode in the main menu.
2. Press the up arrow key until "Option" is selected, and then press the "OK" key.
3. Press the down arrow key until "Active Group" is selected, and then press the "Enter" key.
4. Press the jump down key until the G7 reference file is selected (ie G7_P1w08, G7_P3w08, G7_P5w08), and then press the "OK" key.
5. Press the exit key (ie the middle key).
6. Press the record number. The latest G7 standard will be displayed on the instrument and ΔE can be viewed.
Use G7 data in 528/530 "comparison" mode (please refer to Section 5-51 "Comparison Function" in "X-Rite 500 Series Operating Manual"):
For greater practical availability in the workshop, the G7 reference value can be "specified" in the "comparison" mode. In this mode, ΔL, Δa, Δb, ΔE or other parameters can be displayed:
1. Select the "Compare" mode in the main menu.
2. Press the up arrow key until "Option" is selected, and then press the "OK" key.
3. Press the down jump key until "Clear Reference Value" is selected, and then press the "OK" key.
4. Press the "Exit" key (ie the "Middle" key).
5. Press the down arrow key until the "Reference value" on the left side of the display is selected, and then press the "OK" key.
6. "Ref 01" will be highlighted, press the "OK" key. At this time, the right side of the instrument will display the target value list specified in the G7 file. Use the up or down jump keys to scroll up or down to highlight the specific standard you want to use for "Reference value 01", and then press the "Enter" key.
7. Press the "Exit" key twice (ie the "Middle" key). At this time, ΔE should be highlighted on the right side of the screen. Press the "OK" key.
8. Scroll down to ΔLab and press the "Enter" key.
9. Press the exit key to jump to the left side of the screen, scroll down to "Ref 02" and press the "OK" key. Press the up or down jump key to highlight the standard that you want to associate with "reference value 02", and then repeat step 7 above. (Note: The reference number shown in the table is usually assigned to the G7 reference value.)
10. After specifying the last standard, press the "x" key to return to the main menu. Now scroll up (up jump key) to "Compare" and then press the "Enter" key.
11. Record the indication. The instrument will select the nearest G7 standard display and display ΔL, Δa, Δb and ΔE at the same time. Please note that the instrument does not display the standard name, but only the specified number. Therefore, it is recommended to enter the standards in order to facilitate memory.
Reload the G7 data into the instrument:
1. Install ColorMail Express from the "500 Series Manuals and Utilities" CD, or download it from the X-Rite website below.
2. Save the G7 reference file (ie G7_P1w08.mif) to the computer desktop.
3. Connect the instrument to the computer with a connecting cable (included with model 528/530, X-Rite part number: SE108-92), and then start the ColorMail Express application.
4. Drag the G7 reference file saved on the computer desktop in step 2 to the instrument, and the file will be displayed on the ColorMail Express software screen.
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