Xerox Digital copier printers User Manual

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Contents

Xerox Digital copier printers User Manual Manual pdf 80 page image

66-2 Color CalibrationHow calibration worksSuccess in obtaining satisfactory print quality from a digital color printer depends onmany factors. Among the most important are establishing and maintaining optimaltoner densities. Density is a measure of the light absorbed by a surface. The saturationof toner colors, which affects output densities from your copier, is affected by suchvariables as room humidity and service settings, and also tends to drift over time.Regular calibration corrects for day-to-day variations in densities.Calibration works by creating calibration curves on your Fiery SI server thatcompensate for deviations from desired density values. These calibration curves aregenerated by creating a measurements file—a file containing numerical valuescorresponding to the amount of toner being printed for the full range of colors—andcomparing it to a target.MeasurementsMeasurements files provide numerical values that correspond to your copier’s tonerdensity for each color. To create a measurements file, you can scan a page from yourcopier and use AutoCal, connect an X-Rite DTP32 densitometer to the Fiery SI andrecord values, or connect an X-Rite DTP32 densitometer to your Macintoshcomputer’s modem port or your IBM-PC compatible’s serial port and measure valueswith the Fiery XJ Print Calibrator. You may also be able to connect any Status Tdensitometer to your Macintosh or IBM-PC if you have utility software provided bythe densitometer manufacturer to create a measurements file.TargetsTarget files define desired calibration results. Several target files are provided with theFiery SI, and you can create additional ones as needed by modifying existing targets.When you calibrate the Fiery SI, you can select the target file that corresponds to thetype of printing you are doing.The targets provided with the Fiery SI are:• 5760/65 or 5790—Optimized for best results for specific copier performance. Youshould use the copier target if you are going to use the copier’s ICC profile to printCMYK data or the Color Rendering Dictionaries (CRD). The CRDs are used if youprint an RGB file from Photoshop, or if you use a PostScript Level 2 Printer Driver(Adobe PostScript Printer Driver for Macintosh, Adobe PostScript Printer Driver forWindows, or Apple LaserWriter Printer Driver version 8.0 or later).