HP Color LaserJet 4730 Multifunction Printer series - Manual (Page 187)

Two values are available for the Neutral Grays setting:
● Black Only generates neutral colors (grays and black) using only black toner. This guarantees
neutral colors without a color cast.
● 4-Color generates neutral colors (grays and black) by combining all four toner colors. This method
produces smoother gradients and transitions to non-neutral colors, and it produces the darkest
black.
NOTE Some applications convert text or graphics to raster images. In these cases, setting the
color options for Photographs also affects how text and graphics appear.
ENWW Managing printer color options on Windows computers 167