grayscale
グレースケール
Channel (digital image)
Halftone
Duotone
False-color
Sepia tone
Cyanotype
Morphological image processing
Mezzotint
List of monochrome and RGB color formats – Monochrome palettes section
List of software palettes – Color gradient palettes and false color palettes sections
Achromatopsia, total color blindness, in which vision is limited to a grayscale
Zone System
/suto3/google.icongrayscale
image grayscale
define grayscale
wikipedia grayscale
weblio grayscale
kotobank grayscale
jisho grayscale