Sharp AR-PE3 (serv.man13) User Manual / Operation Manual ▷ View online
2
2-1
An overview of calibration
Calibrating the Fiery X3e ensures consistent, reliable color output. This chapter
explains how
explains how
calibration
works and provides instructions for all calibration
procedures. You can calibrate the Fiery X3e using ColorWise Pro Tools in combination
with any of the following color measurement instruments:
with any of the following color measurement instruments:
• EFI Spectrometer ES-1000 hand-held spectrometer
• EFI Densitometer ED-100 hand-held densitometer
• X-Rite DTP41 automatic scanning spectrophotometer
• X-Rite DTP32 automatic scanning densitometer
By connecting one of these instruments to a serial or USB port on your computer, you
can quickly measure calibration color patches and download measurements to the
Fiery X3e.
can quickly measure calibration color patches and download measurements to the
Fiery X3e.
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:
To use the ES-1000 or ED-100 with a Mac OS computer, you must connect the
instrument to a USB port. You also need an adaptor to connect the ES-1000 or
ED-100 to the Mac OS computer. For more information, contact your service
technician/representative. For information about setting up and operating the DTP41
and DTP32, see
ED-100 to the Mac OS computer. For more information, contact your service
technician/representative. For information about setting up and operating the DTP41
and DTP32, see
Appendix A
.
Another way to obtain measurements is by using the copier/printer’s built-in scanner
as part of AutoCal
as part of AutoCal
™
or ColorCal
™
, which do not require the use of a measurement
instrument and can be run from ColorWise Pro Tools or the Fiery X3e Control Panel.
When choosing a calibration method, keep in mind that methods using a color
measurement instrument such as the ES-1000, DTP41, or DTP32 are generally the
best. We recommend using the ES-1000 because it captures measurements very
accurately and quickly, can be used to calibrate and profile printers using pages with
randomized patches, and can be used to measure and adjust individual spot colors.
measurement instrument such as the ES-1000, DTP41, or DTP32 are generally the
best. We recommend using the ES-1000 because it captures measurements very
accurately and quickly, can be used to calibrate and profile printers using pages with
randomized patches, and can be used to measure and adjust individual spot colors.
Chapter 2:
Color Calibration
Color Calibration
2
2-2
Color Calibration
For information about advanced calibration and simulation features available with
ColorWise Pro Tools, such as editing profiles and creating custom profiles, see
ColorWise Pro Tools, such as editing profiles and creating custom profiles, see
Chapter 3
. A format for inputting color measurements from other
densitometers
is
described in
Appendix B
.
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:
The procedures described in this chapter are fundamentally the same for
Windows and Mac OS computers. The main differences are the interface cable and the
port used to connect to the measurement instrument. The illustrations in this chapter
describe the Windows version.
port used to connect to the measurement instrument. The illustrations in this chapter
describe the Windows version.
N
OTE
:
The term computer is used to refer to any computer running
ColorWise Pro Tools.
An overview of calibration
Calibration generates curves that adjust for the difference between the actual toner
densities (measurements) and the response expected by the output profile.
densities (measurements) and the response expected by the output profile.
• Measurements represent the actual color behavior of the copier/printer.
• Calibration sets are sets of measurements.
• A calibration target that describes the expected behavior of the copier/printer is
contained in each output profile.
After you have calibrated the Fiery X3e, a calibration set is stored. This calibration set
will be used when it is associated with an output profile. Every output profile has an
associated calibration set. If you have not specified one, the calibration set associated
with the default output profile is used.
will be used when it is associated with an output profile. Every output profile has an
associated calibration set. If you have not specified one, the calibration set associated
with the default output profile is used.
If you change the calibration after a saved job has been processed (RIPped), you do not
need to reprocess (reRIP) the job. The new calibration affects the job without needing
to be reprocessed.
need to reprocess (reRIP) the job. The new calibration affects the job without needing
to be reprocessed.
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:
Changing calibration has the potential to affect all jobs for all users, so consider
limiting the number of people authorized to perform calibration. Set an Administrator
password in Fiery X3e Setup to control access to calibration (see the
password in Fiery X3e Setup to control access to calibration (see the
Configuration
Guide
).
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2-3
Understanding calibration
Understanding calibration
Although most users’ needs are met by the default calibration set, the Fiery X3e allows
you to choose a calibration set to customize calibration for specialized jobs.
you to choose a calibration set to customize calibration for specialized jobs.
Calibration allows you to:
• Maximize the color reproduction capabilities of the Fiery X3e.
• Ensure consistent color quality over time.
• Produce consistent output across Fiery X3e servers.
• Achieve better color matches when reproducing
spot colors
, such as PANTONE
colors or other
named color
systems.
• Optimize the Fiery X3e 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 X3e 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
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.
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 X3e 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 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 X3e 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.
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Color Calibration
Measurements
Measurement files contain numerical values that correspond to the toner density
produced by the copier/printer when it prints solid cyan, magenta, yellow, and black,
and graduated tints of those colors.
produced by the copier/printer 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. Then measure the patches
using either a color measurement instrument connected to a computer on the network
or, if it is available, the print device’s scanner. The new measurements are automatically
downloaded to the Fiery X3e.
using either a color measurement instrument connected to a computer on the network
or, if it is available, the print device’s scanner. The new measurements are automatically
downloaded to the Fiery X3e.
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 X3e. When you
calibrate the Fiery X3e, 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
output profiles and calibration sets are provided with the Fiery X3e. When you
calibrate the Fiery X3e, 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
page 1-15
.
Scheduling calibration
In general, calibrate the Fiery X3e at least once a day, depending on the volume of
print jobs. If it is very important to maintain consistent color, or if the copier/printer is
subject to wide fluctuations in temperature or humidity, calibrate every few hours. For
optimal performance, calibrate whenever there is a noticeable change in print quality.
print jobs. If it is very important to maintain consistent color, or if the copier/printer is
subject to wide fluctuations in temperature or humidity, calibrate every few hours. For
optimal performance, calibrate whenever there is a noticeable change in print quality.
If you must split a print job into two or more batches to be printed at different times,
it is especially important to calibrate before printing each batch. You should also
calibrate the Fiery X3e after copier/printer maintenance.
it is especially important to calibrate before printing each batch. You should also
calibrate the Fiery X3e after copier/printer maintenance.
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:
Because printed output from the copier/printer is very sensitive to changes in
temperature and humidity, the copier/printer should not be installed near a window or
in direct sunlight, or near a heater or air conditioner. Paper is sensitive to climate
changes as well. It should be stored in a cool, dry, stable environment, and reams
should remain sealed until they are needed.
in direct sunlight, or near a heater or air conditioner. Paper is sensitive to climate
changes as well. It should be stored in a cool, dry, stable environment, and reams
should remain sealed until they are needed.
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