Specifications

COLORWISE PRINT OPTIONS 15
Black Detection
The Black Detection option allows you to specify whether or not to detect black-and-white
pages before printing your job. To use this option, set Color Mode to CMYK.
•
Off: Select Off if your job consists of black-and-white text pages combined with a
significant number of color pages.
•
On: Select On if you are printing a predominantly black-and-white job. Black-and-white
only pages print with the proper billing information.
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.
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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
and 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 and Graphics option is set to Pure Black On.
•
Off: Black text or text/graphics knocks out colored backgrounds.
NOTE: 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%.
• 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 dry ink. 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 dry inks occurs. The quality of the output is improved, because it does not
show artifacts near the edges of the black text.
• With Black Overprint Off, the border of the text or text/graphics is on an edge that has
cyan and magenta dry inks on one side (outside the text) and black dry ink on the other
side (inside the text). This transition may cause visible artifacts due to the practical
limitations of the digital press.
NOTE: The reproduction of CMYK components is affected by the CMYK/Grayscale Source
setting and calibration curve when CMYK is not 0%, 0%, 0%, 100%.