Definition of grayscale adjective from the Oxford Advanced American Dictionary

     

    grayscale

     adjective
    (greyscale)adjective
    NAmE//ˈɡreɪskeɪl//
     
    (technology)
     
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  1. 1 (of an image) produced using only shades of gray, not color I printed out the pictures in grayscale.
  2. 2(of a printer or scanner) producing images using only shades of gray, not color
See the Oxford Advanced Learner's Dictionary entry: grayscale