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Understanding calibration
C9800 Color Guide - 35
Understanding calibration
Although most users’ needs are met by the default calibration set, the Fiery allows you
to choose a calibration set to customize calibration for specialized jobs.
Calibration allows you to:
• Maximize the color reproduction capabilities of the C9800.
• Ensure consistent color quality over time.
• Produce consistent output across Fiery servers.
• Achieve better color matches when reproducing spot colors,
such as PANTONE
colors or other named color
systems.
• Optimize the Fiery for using ColorWise rendering styles (CRDs) and CMYK
simulations, and for using ICC profiles.
How calibration works
Success in obtaining satisfactory print quality from the Fiery depends on many factors.
Among the most important are establishing and maintaining optimal toner densities.
The density is the measure of the light absorbed by a surface. By carefully regulating
toner densities, you obtain consistent printed color.
Even with a calibrated system, toner density is affected by service settings, humidity,
and temperature; density also tends to drift over time. Regular measurement detects
day-to-day variations in densities, and calibration corrects for them.
Calibration works by creating calibration curves on the Fiery that compensate for the
difference between actual (measured) and desired (target) density values. These
calibration curves are the graphic equivalent of transfer functions, which are
mathematical descriptions of changes that will be made to the initial data. Transfer
functions are often graphed as input or output curves.
The Fiery generates calibration curves after comparing measured values to the final
target values for each of the four toner colors. The target values are based on the output
profile specified.
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