Oki CX3641MFP Technical Reference page 57

C 57
ALIBRATION
Success in obtaining satisfactory print quality from the CX3641MFP 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 the settings of copier/printer,
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, and calibration corrects them.
Calibration works by creating calibration curves on the CX3641MFP 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 CX3641MFP 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.
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.
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, or if it is
available, the print device's scanner. The new measurements are automatically
downloaded to the CX3641MFP.
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 CX3641MFP. When you calibrate the
CX3641MFP, 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 91.