Oki C942dp C931 C941 C942 - Fiery C9 Server - Color Guide - Page 20

Color Printing 20 Color print options Spot color matching The Spot color matching option provides automatic matching of spot colors with their best CMYK equivalents. • On - The C9 Server uses a built-in table to generate the closest CMYK matches of spot colors your printer can produce. (New tables are generated when you add new output profiles.) With Spot-On, the C9 Server uses the CMYK matches determined through Spot-On. • Off - The C9 Server processes spot colors as CMYK data and uses CMYK equivalents defined by the spot color manufacturer, such as PANTONE. These are the same CMYK equivalents used by applications that include spot color libraries. Note: Spot colors that are not included in the built-in table are treated as CMYK. For jobs that include spot colors, turn Spot color matching on unless you are printing press simulations. In that case, turn Spot color matching off and select the appropriate CMYK/Grayscale Source. For a PDF job that includes spot colors that are not included in the built‑in table, turning Spot color matching on retains the original spot colors. The C9 Server references the built‑in table to generate the closest CMYK matches of the original spot color. Note: Use Spot color matching only when printing composites, not when printing separations. Substitute colors Substitute colors are colors that, when called for in a document by their RGB or CMYK values, are substituted with a different color that is defined in the Spot-On color dictionary. This permits exact color control and overrides individual RGB and CMYK colors. Spot-On allows you to create a list of substitute colors. To enable substitute colors for a job, turn on the Substitute colors option. Note: You cannot use Substitute colors at the same time that you use Postflight. When you use Substitute colors at the same time that you use Spot color matching, be sure that the CMYK color that you want to replace with a substitute color is not a CMYK color that is also defined as a spot color. Otherwise, the spot color may be replaced with the substitute color, which may not be the result that you expect. For more information about creating and using substitute colors, see Command WorkStation Help. Use Embedded Profile When Present (CMYK and RGB) You can specify whether the C9 Server uses the source profile (either CMYK or RGB) that is embedded in the print job rather than the source profile specified in the print settings. CMYK If you turn on Use Embedded Profile When Present (CMYK), the C9 Server ignores the CMYK/Grayscale Source option and uses the CMYK profile embedded in the print job (if any) as the CMYK source profile. If you turn off this option, the C9 Server uses the profile specified in the CMYK/Grayscale Source option. When a CMYK profile is embedded in a job and Use Embedded Profiles When Present (CMYK) is enabled for the job, or when a job is sent with PostScript Color Management, the job contains calibrated CMYK (or CIEBasedDEFG) data. For jobs containing calibrated CMYK, the CMYK processing options are not used. Instead, the RGB/Lab Rendering Intent option, which normally affects only RGB or Lab data, is used to process the calibrated CMYK data. The RGB Source setting does not affect calibrated CMYK data.