Canon 2921B002 On-Screen Manual page 529

Adjusting Colors Using a Color Pattern
Below is an example of correcting a bluish image.
Since Blue and Green are too strong, click the Yellow and Magenta arrows to correct.
Before
Note
Color adjustments are applied only to the scan area (cropping frame) specified in the Preview area.
You can also select a color tone from the color pattern displayed on the left of the Color Pattern
screen.
You can also use this function to add a specific tint to an image. Increase the magenta to add a
warm tint, and increase the blue to add a cool tint.
After
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