22. Using ColorWise Pro ToolsXerox Phaser 79022–2Changing calibration has the potential to affect all jobs for all users, so you maywant to limit the number of people authorized to perform calibration. AnAdministrator password can be set from the Fiery Control Panel or in Setupfrom the command workstation to control access to calibration.Understanding CalibrationAlthough most users needs are met by the default calibration set, the Fieryallows you to choose a calibration set to customize calibration for specializedjobs.Calibration allows you to:• Maximize the color reproduction capabilities of the Fiery.• Ensure consistent color quality over time• Produce consistent output across Fiery servers that are connected to thesame print engine.• Achieve better color matches when reproducing spot colors such asPANTONE colors or other named color systems.• Optimize the fiery for using ColorWise rendering styles (CRDs) andCMYK simulations, and for using ICC profiles.How Calibration WorksSuccess in obtaining satisfactory print quality from a color server, such as aFiery connected to a printer, depends on many factors. Among the mostimportant are establishing and maintaining optimal toner densities. Density isa measure of the light absorbed by a surface. By carefully regulating tonerdensities, you can obtain consistent printed color.Even with a calibrated system, toner density is affected by service settings,humidity, and temperature; it also tends to drift over time. Regularmeasurement detects day to day variations in densities, and calibrationcorrects for them.Calibration works by creating calibration curves on the Fiery that compensatefor the difference between actual (measured) and desired (target) densityvalues.Calibration curves are the graphic equivalent of transfer functions, which aremathematical descriptions of changes that will be made to the data you startwith. Transfer functions are often graphed as input or output curves.The Fiery generates calibration curves after comparing measured values tothe final target values for each of the four toner colors. The target values arebased on the output profile specified.
