Specifications

CALIBRATION 57
Calibration works by calculating adjustments that compensate for the difference between
actual (measured) and desired (target) density values. These calibration adjustments are often
depicted as mathematical curves. The EX700i generates calibration curves for each of the four
dry ink colors.
When to calibrate
Calibrate the EX700i at least once a day, depending on the volume of print jobs.
If it is very important to maintain consistent color, or your digital press 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 or printing results are not as
expected.
If you must split a print job into two or more batches to print at different times, it is
important to calibrate before you print each batch. You should also calibrate the EX700i after
digital press maintenance. However, because the digital press may be less stable immediately
after maintenance, wait until you have printed approximately 50 pages before you calibrate.
NOTE: Because printed output from the digital press is very sensitive to changes in
temperature and humidity, do not install the digital press near a window, in direct sunlight, or
near a heater or air conditioner. Paper is also sensitive to climate changes. Store it in a cool,
dry, stable environment, and keep reams sealed until they are used.
To monitor print quality, print the following color pages:
• Color Charts (from Command WorkStation or the digital press touch panel)
• Color reference pages included in the User Software DVD (see page 42)
These pages include fully saturated color patches and pale tints of cyan, magenta, yellow,
and black. Images with skin tones offer a good basis for comparison. Save and periodically
compare the pages you print. If a noticeable change in appearance occurs, calibrate the
EX700i.
When you examine the Test Page, all color patches should be visible, even though they may be
very faint in the five to two percent range. Each patch set should show uniform gradation
from patch to patch as the color lightens from 100% to zero.
If the solid density patches (100% cyan, magenta, yellow, or black) look less saturated over
time, show the pages to your digital press service technician to determine whether adjusting
the digital press can improve output.