Xerox Phaser EX7750, Color Manual

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1-7 Managing color on the EX7750
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The rendering styles associated with the PCL driver do not match those
associated with the PostScript driver.
Pure Black Text/Graphics
The Pure Black Text/Graphics option affects the printout for black text and vector
graphics on a page. Under most circumstances, leave this option set to On. When
Pure Black Text/Graphics is on, black colors generated by applications (for example,
RGB = 0, 0, 0; CMYK = 0%, 0%, 0%, 100%; or K = 100%) are printed using the
maximum amount of black toner allowed by the calibration curve. This means the
black text and line art will not exhibit halftone
artifacts (as long as the printer is
calibrated correctly) and will not be misregistered, since there is only one toner used.
In addition, this setting eliminates
blasting .
For some jobs, it is preferable to clear this option, for example, if the page includes
gradient fills that use black. The following table describes the behavior of the Pure
Black Text/Graphics option with black data defined in different color spaces.
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Use the Pure Black Text/Graphics option only when printing composites, not
when printing separations.
Input
black color
Pure Black Text/Graphics
On Off
RGB Prints 100% black With the default profile, prints a rich black using
all toners.
CMYK Prints only with black toner, because CMYK
simulations preserve the black channel. The actual
amount of toner used depends on the current
simulation and the calibration state of the printer.
Spot Prints only with black toner, because spot color
simulations preserve the black channel. The actual
amount of toner used depends on the current
simulation and the calibration state of the printer.