Xerox 8000AP Manual Suplementar
C
ALIBRATION
46
Success in obtaining satisfactory print quality from the Fiery EX8000AP depends on many
factors. Among the most important are establishing and maintaining optimal toner densities.
The
factors. Among the most important are establishing and maintaining optimal toner densities.
The
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 the settings of digital press,
humidity, and temperature. Density also tends to drift over time. Uneven toner density on
paper affects calibration results. Regular measurement detects day-to-day variations in density,
gradation, and color reproduction. Calibration corrects these variations.
humidity, and temperature. Density also tends to drift over time. Uneven toner density on
paper affects calibration results. Regular measurement detects day-to-day variations in density,
gradation, and color reproduction. Calibration corrects these variations.
Calibration works by creating calibration curves on the Fiery EX8000AP 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 are made to the initial data. Transfer functions are often graphed as input or
output curves.
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 are made to the initial data. Transfer functions are often graphed as input or
output curves.
The Fiery EX8000AP 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.
final target values for each of the four toner colors. The target values are based on the output
profile specified.
Measurements
Measurement files contain numerical values that correspond to the toner density produced by
the digital press when it prints solid cyan, magenta, yellow, and black, and graduated tints of
those colors.
the digital press when it prints solid cyan, magenta, yellow, and black, and graduated tints of
those colors.
To create a measurement file, print a page of color patches. Measure the patches using a color
measurement instrument connected to a computer on the network The new measurements
are automatically downloaded to the Fiery EX8000AP.
measurement instrument connected to a computer on the network The new measurements
are automatically downloaded to the Fiery EX8000AP.
Output profiles and calibration sets
Output profiles and calibration sets define desired calibration results. One or more output
profiles and calibration sets are provided with the Fiery EX8000AP. When you calibrate the
Fiery EX8000AP, select the calibration set that corresponds to the typical printing jobs at
your site. This same calibration set can be associated with one or more output profiles. For
more information about output profiles, see
profiles and calibration sets are provided with the Fiery EX8000AP. When you calibrate the
Fiery EX8000AP, select the calibration set that corresponds to the typical printing jobs at
your site. This same calibration set can be associated with one or more output profiles. For
more information about output profiles, see