Operating Manual

28
Glossary
Absorption
Light passing through an ink film is weakened to a greater or lesser degree,
depending on the thickness of the film and the wavelength of the light. In
combination with the scattering capacity, this produces the optical effect of the
ink.
Additional ink quantity Quantities of inks which have to be added to an ink mixture to bring it closer
to the target color.
Assortment
Clipboard
Color distance dE
Color values
Colorant calibration
An assortment is a selection of colorants used for a recipe calculation. Each
assortment includes one or more transparent white and one substrate.
A WINDOWS program which serves to exchange data between different
programs.
The geometric distance between the color recipe and the target color in the
Lab color system. The sensitivity of the eye to color distance is roughly proportional
to the dE value (dE = 1 is just visible). The color distance is optimized to
the illuminant and observer settings of the program.
Every color can be represented by three values. If two different colors match in
terms of these values, this means that they will appear the same under a
particular form of lighting (e.g. electric bulb light, daylight). Ink Formulation works
with the so-called CIE-Lab-System. The CIE-Lab-System is a color system
adapted to the human eye. In other words, the geometric distance in the color
system (dE) closely represents the visual distance between two colors. For a
more detailed explanation, it will be necessary to refer to the literature on
colorimetry. Here, we note simply the following:
L-coordinate: Measurement for brightness (range from 0 to 100)
a-coordinate: Value of red-green axis (+ a = red / - a = green)
b-coordinate: Value of blue-yellow axis (+ b = yellow / - b = blue)
C-coordinate: Measurement for saturation
h-coordinate: Measurement for hue (range from 0 to 360)
A colorant calibration consists of a certain number of proportionately different
mixtures of an ink with transparent white on white and black substrate. The
absorption capacity of the ink can be determined from the different concentration
grades on white substrate and the scattering capacity from the different
concentration grades on black substrate.
28 • Glossary 205