Xerox 8000AP Supplementary Manual
C
OLOR
W
ISE
P
RINT
O
PTIONS
75
Black Overprint
The Black Overprint option allows you to specify whether or not black text or black text and
graphics, defined as RGB=0, 0, 0, or as CMYK=0%, 0%, 0%, 100%, overprints colored
backgrounds.
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 the
halo effect or misregistration of colors. You can choose this setting only if the Black Text/
Graphics option is set to Pure Black On.
Graphics option is set to Pure Black On.
•
Text & Graphics:
Black text and graphics overprint colored backgrounds, eliminating
white gaps and reducing halo effects or misregistration of colors. You can choose this
setting only if the Black Text/Graphics option is set to Pure Black On.
setting only if the Black Text/Graphics option is set to Pure Black On.
•
Off:
Black text or text/graphics knocks out colored backgrounds.
N
OTE
:
Before sending the print job to the digital press, PostScript applications may perform
their own black overprint conversions.
One example of how you might use this setting is a page that contains black text on a light
blue background. The background blue is CMYK=40%, 30%, 0%, 0%. The black text is
CMYK=0%, 0%, 0%, 100%.
blue background. The background blue is CMYK=40%, 30%, 0%, 0%. 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 color. Black colors
generated by applications (for example, RGB=0, 0, 0 or CMYK=0%, 0%, 0%, 100%) are
printed using the black toner. This means that black text and line art does not exhibit
halftone artifacts (as long as the digital press is calibrated correctly). No transition in cyan
and magenta toners occurs. The quality of the output is improved because it does not show
artifacts near the edges of the text defined in the RGB color space (RGB=0, 0, 0).
generated by applications (for example, RGB=0, 0, 0 or CMYK=0%, 0%, 0%, 100%) are
printed using the black toner. This means that black text and line art does not exhibit
halftone artifacts (as long as the digital press is calibrated correctly). No transition in cyan
and magenta toners occurs. The quality of the output is improved because it does not show
artifacts near the edges of the text defined in the RGB color space (RGB=0, 0, 0).
• With Black Overprint Off, the border of the text or text/graphics is on an edge that has
cyan and magenta toners on one side (outside the text) and black toner on the other side
(inside the text). This transition may cause visible artifacts due to the practical limitations
of the digital press.
(inside the text). This transition may cause visible artifacts due to the practical limitations
of the digital press.
N
OTE
:
Setting Black Overprint to Text/Graphics allows black text or graphics to overprint
color backgrounds (see
N
OTE
:
The reproduction of CMYK components is affected by the CMYK Simulation setting
and calibration curve when CMYK is not 0%, 0%, 0%, 0%.