User guide

X-Rite eXact™ Instrument
47
Relative Color Strength Function
The relative color strength "DS" is a measure which compares the concentration of a color with
the concentration of a standard. DS is the ratio between the absolute color strength K/S of a
sample and the absolute color strength K/S of the standard color.
The relative color strength DS indicates the extent to which a color is concentrated in comparison
with the standard color. If for example DS = 50% means that the sample color is only half as
concentrated as the standard color.
Depending on the circumstances, different formulas can be selected for the calculation of the
absolute color strength K/S. For transparent inks, the sample color must be applied in an equally
thick layer as the standard color. Only in this way can a statement be made regarding the color
concentration.
Concentration (conc) indicates the extent to which a color should be concentrated to correspond
as accurately as possible to the standard. Residual color difference (rsΔE) is used to investigate
whether the sample is actually the same as the standard. It compensates the sample to the
concentration of the standard and calculates a CIE delta E76 to it.
This function requires a valid standard so it cannot be used in the Basic Tool.
Color Strength Function Settings
See Color Strength Function Settings for the Absolute Color Strength Function description.
Relative Color Strength Measurement
1. Select Relative Color Strength.
2. Measure paper if required.
3. Select or measure a standard.
4. Measure the sample.
5. View data.
Color strength
Concentration value
Residual color difference
value
Simulated color of standard
Function, illum/obs, and
Measurement Condition
selected
Simulated color of sample
K/S value at wavelength
Function, illum/obs, and
Measurement Condition selected
K/S value at wavelength
Simulated color and timestamp of
reading displayed