Black Overprint - Oki CX3641MFP Technical Reference

C W P O
OLOR ISE RINT

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.
• Black text overprints colored backgrounds, eliminating white gaps and reducing
Text:
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.
• Black text and graphics overprint colored backgrounds, eliminating
Text & Graphics:
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.
• Black text or text/graphics knocks out colored backgrounds.
Off:
Before sending the print job to the copier/printer, PostScript applications may
N :
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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%.
• 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 copier/printer 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 copier/printer.
N : Setting Black Overprint to Text/Graphics allows black text or graphics to
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overprint color backgrounds (see
N : The reproduction of CMYK components is affected by the CMYK Simulation
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setting and calibration curve when CMYK is not 0%, 0%, 0%, 0%.
PTIONS
"CMYK Simulation Method"
85
on page 88).