Xerox DocuColor 12 Printer with Fiery X12 Merkblatt

applications (such as Microsoft Word) are converted to single-color black (CMYK = 
0%, 0%, 0%, 100%) by the Microsoft PostScript Level 2 driver for Windows NT 4.0. 
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.

The Black Overprint option lets you 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 

reducing halo affects or misregistration of colors. Setting Black Overprint to On 
automatically activates the Pure Black Text/Graphics option.

•

—Black text knocks out colored backgrounds.

PostScript applications may perform their own black 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 some 
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. 

• With Black Overprint Off, the border of the text 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). On many devices, this transition causes visible artifacts because of 
the practical limitations of the copier. 

This feature is not available with the PCL driver.