Spot Color Matching - Oki ES3640eMFP Color Manual

1
1-23 Managing color on the Fiery
•
Text & Graphics
backgrounds, eliminating white gaps and reducing halo effects
or misregistration of colors.
• —Black text or text/graphics knocks out colored
Off
backgrounds.
PostScript applications may perform their own black
Note:
overprint conversions before sending the print job to the Fiery.
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 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.
• 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 because of the
practical limitations of the printer.

Spot Color Matching

The Spot Color Matching option provides automatic matching of
spot colors with their best CMYK equivalents.
ES3640e MFP Color Guide - 23
—Black text and graphics overprint colored