Toshiba manual Black Overprint, Managing color on the GA-1121

11-9

Managing color on the GA-1121

see the application notes. Also, black text and line art defined as RGB = 0, 0, 0 in office applications (such as Microsoft Word) are converted to single-color black (CMYK = 0%, 0%, 0%, 100%) by the Microsoft PostScript Level 3 driver for Windows 2000/XP. To print this single-color black at the maximum toner density of the copier/printer, set the Pure Black Text/Graphics option to On.

NOTE: This feature is not available with the PCL driver.

Black Overprint

The Black Overprint option allows you to specify whether or not black text or text/graphics—defined as RGB = 0, 0, 0, or as CMYK = 0%, 0%, 0%, 100%— overprints colored backgrounds.

•Text—Black text overprints colored backgrounds, eliminating white gaps and reducing halo effects or misregistration of colors.

•Text & Graphics—Black text and graphics overprint colored backgrounds, eliminating white gaps and reducing halo effects or misregistration of colors.

•Off—Black text or text/graphics knocks out colored backgrounds.

NOTE: PostScript applications may perform their own black overprint conversions before sending the print job to the GA-1121.

One example of how you might use this setting is with a page that contains black text on a light blue background. The background blue color is CMYK = 40%, 30%, 0%, 0% and the black text is CMYK = 0%, 0%, 0%, 100%.

•With Black Overprint set to Text or Text & Graphics, the final text or text/graphic portions of the page are overprinted, or combined with the underlying colors. Black colors generated by applications (for example, RGB = 0%, 0%, 0%; CMYK = 0%, 0%, 0%, 100%) are printed using the maximum amount of black toner allowed by the calibration curve. This means that black text and line art will not exhibit halftone artifacts (as long as the copier/printer is calibrated correctly). There is no transition in the cyan and magenta toners, and the quality of the output is improved since it will not show artifacts near the edges of the text or text/graphics. The option also works with text defined in the RGB color space, that is RGB = 0, 0, 0.