Ricoh InfoPrint Pro C900AFP InfoPrint Manager - Page 47
Measuring optical density with a densitometer
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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