grayscale
noun /ˈɡreɪskeɪl/
  /ˈɡreɪskeɪl/
(US English) (also greyscale especially in British English)
 (specialist)- a range of shades of gray, not color灰度 -  in grayscale I've printed out the pictures in grayscale.我已经用灰度打印出了这些图片。 
- a grayscale scanner灰度扫描仪 
 
-  in grayscale I've printed out the pictures in grayscale.