Canon LBP7660Cdn Manual page 307

Specify color printing or B&W printing.
[Color Mode]
It sets which color matching method to apply for each piece of text, diagram or image that
make up a print job, or for every color space such as RGB or CMYK. You can select whether
to use methods such as ICC profile and gamma for processing. The items that can be set
[Auto (Color/Black It automatically switches between color and black and white printing
and White)]: depending on the type of document.
[Black and White]: Even color documents are printed in black (Bk) only.
[Color]: It prints in 4 colors: cyan (C), magenta (M), yellow (Y) and black
(Bk).