[Gray Step]
Overview
Display the [Accuracy Measurement] result with numeric values and graph.
Check the gray reproducibility, and judge whether or not advanced calibration is required.
Tips
- The displayed items vary depending on whether Advanced Calibration mode is set to Exact Color or G7 Calibration in Color Centro.
- In Color Centro, Exact Color is set by default. You cannot additionally set G7 calibration to Color Centro which already has Exact Color set, and use them together. When switching to G7 calibration, contact your service representative.
- Lab color space is a color system that indicates the brightness by L* and the chromaticity indicating hue and saturation by a*, and b*.
Setting Items
For [Exact Color]
Setting item | Description |
|---|---|
[ΔE Ave.] | Displays the ΔE average value for [Gray Step] of the Exact Color target. ΔE refers to a color difference. It indicates a distance between 2 points in the Lab color space. The ΔE value indicates a color difference. |
[ΔE Max.] | Displays the ΔE maximum value for [Gray Step] of the Exact Color target. ΔE refers to a color difference. It indicates a distance between 2 points in the Lab color space. The ΔE value indicates a color difference. |
[Gray Step] graph | Displays the gray balance of [Gray Step]. [Δa*] refers to a difference between the Exact Color target and a* of the measurement value in the Lab color space. "a*" indicates the red direction, and "-a*" indicates the green direction. The higher the a* value, the stronger the red, and the lower the -a* value, the stronger the green. [Δb*] refers to a difference between the Exact Color target and b* of the measurement value in the Lab color space. "b*" indicates the yellow direction, and "-b*" indicates the blue direction. The higher the b* value, the stronger the yellow, and the lower the -b* value, the stronger the blue. |
For [G7 Calibration]
Setting item | Description |
|---|---|
[Gray Balance] | Displays the color reproduction result with the gray CMY ratio defined in G7, and also the wΔCh value that is the difference between the target color and saturation. |
[Gray Balance] graph | Displays the measurement result of [Gray Balance]. This indicates that as the value of the vertical axis in the graph is higher, the image is brighter, and as the value is lower, the image is closer to achromatic mode. [Δa*] refers to a difference between the Exact Color target and a* of the measurement value in the Lab color space. "a*" indicates the red direction, and "-a*" indicates the green direction. The higher the a* value, the stronger the red, and the lower the -a* value, the stronger the green. [Δb*] refers to a difference between the Exact Color target and b* of the measurement value in the Lab color space. "b*" indicates the yellow direction, and "-b*" indicates the blue direction. The higher the b* value, the stronger the yellow, and the lower the -b* value, the stronger the blue. ΔCh refers to a difference between the target and saturation in the Lab color space. |
[Delta-L*] | The following items are displayed.
|
[Delta-L*] graph | Displays the measurement result of [Delta-L*]. This indicates that as the value of the vertical axis in the graph is higher, the image is lighter, and as the value is lower, the image is darker. CMY indicates the adjustment result of gray. K indicates the adjustment result of black only. |
in the upper-right of a page, it turns into 
and is registered as a bookmark.