Kyocera TASKalfa 2551ci Driver Manual page 79

Imaging
This option prints grayscale with black only. Full color must be selected as
the Color mode.
Continuous tone
Images are represented by a series of evenly graduated tones, as in a
photograph. Full color must be selected as the Color mode. Continuous
tone is selected automatically.
Print graphics as black
This option prints all color graphics with black, rather than grayscale. This
feature is implemented for CAD applications. Black & White must be
selected as the Color mode.
Composite overprint
This option blends overlapping images into a composite image. This feature
is available if KPDL is selected in the PDL Settings dialog box. Full color
must be selected as the Color mode.
Printer Driver 8-13