Gamma Curve Settings

This section describes the procedure for adjusting the gamma level for scanning documents.

1In the ISIS/TWAIN driver properties dialog box, click the [Brightness] tab → click [Gamma].

2Select the [Custom] check box in the [Gamma Settings] dialog box → specify the settings as necessary.

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-Input method

Select the setting method for gamma correction.

-[Factor]

Move the slider to the left or right to adjust the gamma correction factor between 0.2 and 5.0.

y The gamma correction value, Gamma Curve Graph, and sample image color are interlinked.

y Clicking a point in the Gamma Curve Graph with your mouse changes the gamma curve and color of the sample image to match that point.

y You can also move the gamma curve by dragging it with the mouse.

-[Freehand]

The output value for a particular input value in the gamma table can be specified with the mouse.

y Click any point in the Gamma Curve Graph to set that point as an output value.

y Drag the mouse on the Gamma Curve Graph to set the output value according to the mouse movement.

-[Import]

Clicking this button loads gamma table data (*.png file) that was previously stored with the [Export] button.

y Imported gamma data is reflected in the Gamma Curve Graph.

-[Export]

Clicking this button exports the custom gamma curve settings as a gamma table file (*.pxg.)

The settings you can specify are as follows:

-Select

Select the side and color for the custom setting.

y The color bar and color of the sample image are changed to show the specified color.

NOTE

When the [Custom] check box in the [Gamma Settings] dialog box is selected, all settings on the [Brightness] tab sheet are set automatically.

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