Black Overprint - EFI KM-C1530 Color Manual

1
1-13 Managing color on the Fiery X3e
PostScript applications, such as QuarkXPress, may convert elements defined as
N :
OTE
RGB = 0, 0, 0 to four-color CMYK black before sending the job to the Fiery X3e.
These elements are not affected by the Pure Black Text/Graphics option. For details,
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, set the Pure Black Text/Graphics option to On.
This feature is not available with the PCL driver.
N :
OTE

Black Overprint

The Black Overprint option allows you to specify whether or not black text—
defined as RGB = 0, 0, 0, or as CMYK = 0%, 0%, 0%, 100%—overprints colored
backgrounds.
• —Black text overprints colored backgrounds, eliminating white gaps and
On
reducing halo effects or misregistration of colors. Setting Black Overprint to On
automatically activates the Pure Black Text/Graphics option.
• —Black text knocks out colored backgrounds.
Off
PostScript applications may perform their own black overprint conversions
N :
OTE
before sending the print job to the Fiery X3e.
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 On, the final text portions of the page are overprinted, or
combined with the underlying colors. This results in CMYK = 40%, 30%, 0%,
100% for the color used for the text. 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. The option also works with text defined in the RGB color
space, that is RGB = 0, 0, 0.