Panasonic KX-P8420 User Manual
134
Color Calibration
VisualCal, 30% match calibration
VisualCal
TM
is a calibration method that allows you to calibrate your printer
to an ideal color output standard.
The calibration calculations performed by the controller software are based
on a series of values entered through the front panel. The values used in
the calculations are determined by evaluating toner densities and color
combinations produced on two specially designed calibration pages printed
from the front panel.
on a series of values entered through the front panel. The values used in
the calculations are determined by evaluating toner densities and color
combinations produced on two specially designed calibration pages printed
from the front panel.
The first VisualCal page,
Limits, 30% Match
, provides the basis for
calculating the most acceptable luminosity (brightness) of the toners. This
page contains rows of CMYK dots in a graduated range of toner densities.
page contains rows of CMYK dots in a graduated range of toner densities.
The variables needed to recalculate the density of the colored toners are
determined by identifying the leftmost dots that can be fully distinguished
against their fields in each row, and sequentially entering their
corresponding numeric values via the front panel. The variable needed to
recalculate the luminosity of the toners is determined in a slightly different
way- the user is required to identify the black dot which best matches a 30%
dot gain field. When all values have been entered, the printer’s toner
density and luminosity settings are recalculated.
determined by identifying the leftmost dots that can be fully distinguished
against their fields in each row, and sequentially entering their
corresponding numeric values via the front panel. The variable needed to
recalculate the luminosity of the toners is determined in a slightly different
way- the user is required to identify the black dot which best matches a 30%
dot gain field. When all values have been entered, the printer’s toner
density and luminosity settings are recalculated.
The second VisualCal page,
Gray Balance
, provides the basis for
calculating a
neutral gray balance
, that is, a CMY gray that as closely as
possible matches a pure K (BlacK) gray produced by the printer’s engine.
This page consists of rows of CMY gray patches on a field of gray produced
solely from black. The variables needed to calculate the printer’s most
neutral gray balance are determined by identifying the CMY patch that best
matches this field, and entering its row and column location on the front
panel. When the values have been entered, the printer’s gray balance is
recalculated.
This page consists of rows of CMY gray patches on a field of gray produced
solely from black. The variables needed to calculate the printer’s most
neutral gray balance are determined by identifying the CMY patch that best
matches this field, and entering its row and column location on the front
panel. When the values have been entered, the printer’s gray balance is
recalculated.
NOTES:
•
Print the Gray Balance page before the Limits calculations are made, so
the gray field on which the CMY patches appear (on the Limits page)
reflect the new density and luminosity calibration settings.
the gray field on which the CMY patches appear (on the Limits page)
reflect the new density and luminosity calibration settings.
•
VisualCal/Color Adjustment
1. You cannot perform VisualCal or Color Adjustment if the printer
displays error or warning messages. If you encounter error messages,
be sure to troubleshoot them in advance.
be sure to troubleshoot them in advance.
2. If you unintentionally enter an incorrect value during VisualCal
calibration, you may see poor color output.