What Is Color & How Do We Measure It?
Color Measurements try to replicate what the human eye will see and eliminate the variation between individual perceptions with a standard comparative scale. Three main color scales are employed in the industries we serve. CIE L*a*b*; Hunter L,a,b; and Agtron. The most important determining factor in scale selection is consistency in using the same scale, and historic data in a specific color scale.
CIE L*a*b* and Hunter L,a,b are both based on the established CIE L*a*b* scale. This scale uses three parameters to represent human eye color perception and plots it into a tristimulus three dimensional format.
- The ?L*? axis representing Light to Dark values.
- The ?a*? axis representing Red to Green values.
- The ?b*? axis representing Yellow to Blue values.
The CIE L*a*b* tries to correct or match the non-linearity present in the human eye by using the ?cube root? of the XYZ scale. The Hunter L,a,b makes it calculations based on the ?square root? values of the XYZ scale. Both scales work as long as they are used consistently. Allegedly the Hunter has greater color discrimination in the yellow zone on low values and the CIE has greater color discrimination on darker colors.
The Agtron scale is based on red-yellow-green-blue (RYGB) reflectance to provide a numeric score for each of these color bands in the visible spectrum. There are several other color scales too.
The MCT-MultiPlex Color Meter is a white light source Color Meter with flexible software to meet your color measurement needs.