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CHAPTER 2
– Measurement functions
Remission Curve
The function
Remission Curve
offers the complete spectral graph.
Remission values are shown in 10 nanometer
steps in the spectral range of 400 to 700 nm.
A remission value has a range between 0 (no
remission, absolute darkness) and 1 (total re-
mission of the emitted light).
The remission curve is the most exact and to-
tal description of a color.
SCCA reference value correction
The practice of following print standards like
ISO 12647 that pre-defines the combination
of ink, paper and target reference colors for
commercial printers to use in production is in-
valuable. But if the paper does not fall within
the specified target values the accuracy of
the press run is greatly diminished. The more
out of spec the paper is the worse the color
match will be.
One member of the IDEAlliance Print Prop-
erties & Colorimetric Committee, David Mc-
Dowell, developed a formula that recalculates
the data set with new aim points based on
the specific paper color being used on press.
It is called
SCCA
(Substrate Corrected Colori-
metric Aims).
Techkon became aware of this new specifica-
tion and implemented the ability to measure
the paper and based on those measurements
and using the
SCCA
formula calculates new
aim points right on the instrument. This fea-
ture will allow printers to quickly and easily
achieve an acceptable color match regardless
of the presence of optical brightening agents
in their substrates.
