Chapter 29. Configuring The Halftone Management System; Limitations Of Actual Screen Frequencies And Angles On Infoprint 4000 And 4100 Printers - Ricoh InfoPrint Pro C900AFP Manual

Chapter 29. Configuring the Halftone Management System

The Print on Demand feature offers the Halftone Management System (HMS). The
HMS supports printer calibration on devices such as the InfoPrint 20 and the
InfoPrint 4000 series. The Halftone Management System gives you the ability to
calibrate halftones for each screen frequency on most Intelligent Printer Data
Stream (IPDS) printers. The result is consistent grayscale for each appearance
selection. For a complete list of supported printers, see the calibd.src file located in
the /usr/lpp/pd/ipcal/server directory.
With the Halftone Management System, you can run multiple InfoPrint 4000 and
4100 printers and calibrate each system. For two-engine duplex print systems, the
Halftone Management System also lets you calibrate each print engine separately,
so that whatever document you print, the various levels of gray (grayscale) used to
print the document will look the same on both engines. Note that this applies to
input file types of TIFF, GIF, JPEG, PostScript, and Portable Document Format
(PDF).
From the smallest network printer to the largest production printer, you can either
use the halftone provided with InfoPrint Manager or create your own. You can
calibrate for different paper types to account for differences between supplies.
InfoPrint Manager will save and manage these calibrations, allowing you to select
them on a job-by-job basis.
The Halftone Management System consists of two parts that are only installed with
the Print-on-Demand feature:
1. A client process that can be run from any InfoPrint for AIX server.
2. A server process that runs on all InfoPrint for AIX servers.
You can calibrate printers on any InfoPrint AIX server by using the client from
another InfoPrint AIX server. For example, if you have installed InfoPrint servers
A, B and C, you can calibrate printers on A using the client on either A, B or C.
The daemon must be running on server A.
This section describes the procedures that you should make sure have been
completed before attempting to use the Halftone Management System:
1. "Starting the Halftone Management System" on page 284
2. "Calibrating a densitometer" on page 285
Limitations of actual screen frequencies and angles on InfoPrint 4000
and 4100 printers
If you change the version of toner used with your printer, you should recalibrate
all customized calibration curves to make sure that they print correctly. The screen
frequencies shown in this section presume the use of a 600 dots per inch (DPI)
printer. Frequencies at other DPI are proportionally lower. For example, an 85 lines
per inch (LPI) screen used on a 300 DPI printer will be 43 LPI. Screen frequencies
match the requested screen frequency as closely as possible, based on constraints of
the halftone design.
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