greyscale
grey scale |ˈɡreɪskeɪl | ▶noun British spelling of grayscale.
grey |scale |ˈɡreɪskeɪl | ▶noun Computing a range of grey shades from white to black, as used in a monochrome display or printout: [ as modifier ] : a greyscale scanner.
The Wordsmith Dictionary
The Wordsmith Dictionary