Canon imageCLASS MF5730 Software Manual page 138

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When adjusting a color image, click
tool) ➞ click a point in the preview image to specify the point to
execute gray balance adjustment.
The gray balance adjustment ensures that gray elements within a scanned image
appear as a neutral gray, and consequently, other elements within the image will also
have true color reproduction.
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Setting Preferences and Scanning with ScanGear MF
Click (Mid-point eyedropper tool) then click a point in the preview image to specify
the midtone point.
You can also enter a value (5 to 250).
Click (White-point eyedropper tool) then click a point in the preview image to
specify the highlighted point.
You can also enter a value (10 to 255).
Drag the triangles at the bottom of the histogram to an appropriate level.
Areas on the left of (parts darker than the value specified in [Black-point]) will
turn black.
The area at (parts specified in [Mid-point]) will turn to a color exactly between
black-point and white-point.
Areas on the right of
turn white.
(parts lighter than the value specified in [White-point]) will
(Gray Balance eyedropper