You can open this view by clicking the "ab diagram" tab.
Display of ab plane
On the ab plane, the print process in the L*a*b* color space is viewed from above, i.e. from the direction of white, and the lightness axis L* is perpendicular to the red-green a* axis and the yellow-blue b* axis. The closer a color is to the edge of the diagram, the greater its chroma. The angle indicates the hue. Every color mixture can be defined uniquely and displayed in the L*a*b* color space.
In the ab diagram, lines join up the locations of primary and secondary colors and give you an idea of the size of the color gamut. By displaying a reference and a comparison data set together, you can compare the position and size of two color gamuts with the help of these "cobwebs" and/or measuring points.
Display
To the right of the diagram, you can define various settings for viewing the color space:
•"Reference data", "Comparison data": You can select the color to show the data (dots and cobweb) of the reference and comparison data. The following colors are set by default:
·Reference data: Blue
·Comparison data: Red
•"Dots": Display with or without measuring points
The small dots that can be seen are the color values (locations) of all the patches measured in the test chart or control element.
•The green circles/ellipses mark the tolerance range in the process standard for each process color. This graph shows the size of the color space and the position of the process colors in relation to the tolerance range.
•"Cobweb": Display with or without cobweb
The "cobweb" joins up the locations of certain color patches selected in the test chart (primary and secondary colors) and gives you a rough idea of the size of the color gamut.
Only the outline of the color gamut is shown in the xy diagram when you uncheck this box.
•You can print the view as a log (see General Information about Printing).