Canon DR-2510M - Manual (Page 77)

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77
This section describes the procedure for adjusting the gamma level for scanning
documents.
Under Windows
1
In the ISIS/TWAIN driver properties dialog box, click the [Brightness] tab
→ click [Gamma].
2
Select the [Custom] check box in the [Gamma Settings] dialog box →
specify the settings as necessary.
Under Mac OS X
1
Switch to Advanced Mode and click [Gamma Settings].
The [Gamma Settings] dialog box appears.
2
Click [Custom] in the list box at the top and then set the respective items.
Gamma Curve Settings