Techkon SpectroDens Manual page 42

In colorimetry the white reference is absolute in contrary to densitometry where the
white is usually referenced to paper white. Before making colorimetric measurements,
an absolute white calibration has to be carried out by placing SpectroDens on the
charging console and calibrating on the round, white ceramic standard.
The color distance ∆E* describes how close two colors match. A value of 0 means
that they are identical. ∆E*-color differences in the range of 5 can be seen by the
human eye when reference and sample are close together and observed at the same
time.
Color comparison:
Reference Sample
Page 42 Manual TECHKON SpectroDens Chapter 2 – Measurement functions
Colorimetric measurements can only be
compared when the measurement conditions
are the same:
• Polfilter: off
• White reference: Absolute
• Illuminant: D50
• Observer: 2°
When selecting "Auto" in the polarizing filter
setting, there will be automatically the polar-
izing filter inactivated when making colori-
metric measurements.
For measurements of the color distance ∆E*
of two different colors, activate the DELTA
Mode first by selecting the "soft key" with
the triangle icon. Now two measurements
are made:
1. Reference measurement
2. Sample measurement
The color distance ∆E* is displayed with two
digits. Additionally the components ∆L*, ∆a*
and ∆b* can be seen.