Chapter 1. Color Management Background - Kodak

Chapter 2.
Using ColorWise Pro
Tools
Calibrator
Calibration is defined as the act of changing a device’s behavior to
achieve some desired state. That desired state is that which the device
was in when its ICC profile was created. The ability to put the device back
into that “golden” state is how consistent, reliable color is achieved.
The product of calibration is a set of correction curves. These are one
dimensional curves that signify the difference between the actual ink
densities and the response expected by the output profile. They are
applied to each color plane of the data, so they are not what is referred to
as four dimensional curves, which operate on all the color planes
together, so that it would be possible to add a percentage of one color to
another.
Some terms to define are:
Measurement
Calibration Set
Golden Densities
the CURRENT color behavior of the press
a set of measurements
describes the expected behavior of the press within
the output profile
All output profiles have an associated Calibration Set and Golden
Densities. There are 8 named calibration sets. This means you can have
measurement data for 8 different papers stored at the same time. The
appropriate Calibration Set needs to be selected at calibration time so
that the Fiery knows which to update with new measurements. It is also
important to note which paper belongs to which set.
When To Calibrate
Calibration can be preformed whenever the operator determines that the
press is in a different state than when the Golden Densities were
collected. This can be daily, weekly, monthly, etc. If it is suspected that the
press has changed states, calibration can be initiated and evaluated, so
that if it is determined that it is not very different after-all, calibration can
be thrown out and the profile will continue to use the last know set of
calibration curves.
When calibration occurs, it will affect all jobs in the print cue. This means
any jobs that have been spooled, that have been processed and jobs that
have been released for print.
Color Management and Workflow User Guide 2 - 1