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CHAPTER 2 – Measurement functions

The thematic separation between densito-

metric and colorimetric functions is displayed

by a dotted line within the measurement

function window. CIE stands for the interna-

tional color institute Commission Internatio-

nale de l’Eclairage which publishes the stan-

dards for colorimetry.

The most popular color system in the printing

industry is the CIE L*a*b* color space. Every

color is precisely described by three values:

The L*-value stands for the luminance and can

have values between 0 (a theoretical, abso-

lute Black) and 100 (a theoretical, ideal White).

The a*-value describes the color value on the

Green/Red-axis (- a*: Green, + a*: Red) and the

b*-value the color value on the Blue/Yellow-

axis (- b*: Blue, + b*: Yellow).

Colorimetric L*a*b*-measurement on a blue

sample. The blue color has a low luminance

of L = 47.21 and a low portion of Red.

2.2 Additional functions of SpectroDens Advanced

CIE L*a* b*

The previously described measurement functions all were based on densitometry.

Thanks to the spectral performance of SpectroDens it is possible to calculate and dis-

play colorimetric values as well. Measurements in colorimetry modes have the advan-

tage of an absolute description of color based on characteristic values.

L* = 0

L* = 100

h* =

0h* = 180

L* = 50

Techkon SpectroDens User Manual

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