Canon MG5100 series On-Screen Manual page 728

Move the slider to adjust the contrast. Moving it to the left will decrease the contrast of the image,
thus softening the image. Moving it to the right will increase the contrast of the image, thus
sharpening the image. You can also enter a value (-127 to 127).
Resolution (DPI)
Enter the resolution. Specify a value between 50 dpi and 600 dpi.
Resolution
Picture type
Select the type of scan you want for your document.
Reset
Click to restore the original settings.
6.
Click Preview to preview the image.
The preview image appears on the right. Drag
7.
Click Next and follow the instructions.
to specify the scan area.
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