Canon MG8100 series On-Screen Manual page 278

Note
When the Grayscale Photo checkbox is selected, preview images appear in grayscale in the Layout/
Print screen. However, they appear in color in the Correct/Enhance Images window.
In the Adjust Grayscale window, you can adjust the black color tone of grayscale photos.
To display the Adjust Grayscale window , select the Grayscale Photo checkbox in the Select Paper
screen and click (Adjust Grayscale) in the Layout/Print screen. See Help for details.
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