Measuring optical density with a densitometer
This procedure describes how you can measure optical density using the XRITE
400B Densitometer. While you can use other densitometers, this procedure has
been verified with this particular make and model. Ensure that the density
readings are absolute, not paper reference.
1.
Press the
FUNCTION
key until DEN appears. If DEN-R appears, press the
ZERO
key and try again.
2.
Center the circle on the base of the densitometer over the area to be measured.
3.
Push the head down and release it to measure the Optical Density (OD).
The density reading will appear as X.XXD.
4.
Record the X.XX value as it is displayed.
Several measurements should be taken at different representative locations on
each gray patch and averaged to obtain an accurate OD value. Alternately, you
can enter individual measurements into the calibration value screen and have
the averaging done automatically.
Specifying a halftone for printing on the InfoPrint AIX server
You can use a particular halftone for printing a grayscale file through either
InfoPrint Submit Express interface or the AIX command line.
Note:
The Halftone Management System does not need to be running when you
print the job.
Printing from InfoPrint Submit Express
You can print using a particular halftone for printing a grayscale file from a job
ticket (
name
.jtk file) in InfoPrint Submit Express. Begin by selecting a value in the
Halftone
field of the
Look
tab. Note that all halftones shipped with the product
have the term 'ibm' prepended to their identifier. If you are accessing this interface
for the first time, all of your previous default calibrations will have 'ibm' attached
to the name.
InfoPrint Manager lets you determine output appearance on a job-by-job basis by
setting a default halftone in a default document or job object.
Note:
InfoPrint Submit Express is part of the InfoPrint Manager Print-on-Demand
feature.
Printing from the AIX command line
You can submit a halftone calibration from the AIX command line by using some
variation of the
pdpr
command:
pdpr -p sip20-sage -x halftone=ibm106lpi:highlight-midtones grayscale.ps
where the
-x
value is the customized calibration file and
grayscale.ps
is the file to
be printed.
Note:
When submitting a
pdpr
command from the AIX command line, you can
specify the
halftone
attribute. The actual halftone name for this example
(
ibm106lpi:highlight-midtones
) can be found either by using the
InfoPrint
Manager Administration Interface
to look up the halftones supported for the
Chapter 2. Installing and configuring printer devices and related hardware
33
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