Oki ES2426dn Reference page 82

Color Control
OKI Color Matching
Affects RGB data only. This is the default setting and provides the
fastest, best color matching for your printer.
Postscript Color Matching
Uses PostScript Color Rendering Dictionaries built into the
printer, and affects both RGB and CMYK data.
No Color Matching
No color correction occurs when selected. This option is beneficial
when other matching regimens are used, specifically if you select
a Color Simulation option.
Print In Grayscale
No color will print. The printer will interpret all colors as a variation
of grays.
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