Canon MG8100 series On-Screen Manual page 349

Important
If the print result after adjusting the brightness and contrast is different from the preview image,
print a color pattern and adjust the colors again based on the pattern.
Adjusting Brightness/Contrast Using Sample Patterns
The brightness/contrast adjustment applies to all images to print.
Note
For Brightness, move the slider to the right to brighten and left to darken the image.
For Contrast, move the slider to the right to increase and left to reduce the contrast of the
image.
4.
Click OK.
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