Four histograms are displayed when you click the "ΔLCH report" tab.
Display of the delta histograms
These four histograms display the frequency distribution of differential color values for the data measured in the two selected data sets.
You can view the frequency of actions in a histogram or bar graph. The frequencies can be specified as absolute values or relative (in percent) to the maximum frequency.
These histograms display the frequency of differential values. The horizontal axis displays the size of these differential values. The vertical axis displays the frequency of these differential values. In other words, the histogram provides you with information about the number of differential values of a certain size.
You can assume that the color data of both data sets are well matched if the greatest frequencies are found in the low-range values and if the frequency tends towards 0 as the error magnitude increases. With identical data sets, there is only one bar at 0 as no deviations can occur. By contrast, a greater number of bars means greater deviation and, consequently, a bad match of the two data sets.
•ΔE: The first histogram shows the frequency of color distances Δ between 0 and 16.
•ΔL, ΔC, ΔH: The other three histograms show a frequency distribution of differences relating to lightness (ΔL), to chroma (ΔC) and hue angle (ΔH) between -8 and +8. Based on these diagrams, you can recognize probable fluctuations in saturation.
All values that are not within the displayed range are marked by a red bar.
The following data are shown to the right of the histograms:
•"Mean"
•"StdDev" = Standard deviation
•"Max" = maximum deviation value
•"Extr." = extreme value (greatest positive or negative value)
•"Max.Ind" or "Extr.Ind" = index number of the patch with the greatest deviation