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Understanding EPSON TWAIN Features

Image Controls

Click the Image Controls button on the Manual mode window to view the following dialog box.

Note:

The Image Controls settings are optimized automatically when you scan without previewing.

The Image Controls button appears dimmed and is not available when ICM or ColorSync is selected in the Configuration dialog box.

If Image Type is set to Text/Line Art, all the settings except Threshold appear dimmed and cannot be selected.

You can see the effects of the Image Controls settings in the Preview window.

Exposure:

The Exposure setting lightens or darkens an image. You can select from -10 (darkest) to 20 (brightest) by moving the slider.

The Exposure and Highlight controls are related. When the Exposure setting is changed, the Highlight value is automatically set.

Gamma:

The Gamma control allows you to adjust the mid-tones in an image. You can select from 50 (darkest) to 500 (brightest) by moving the slider.

Highlight:

The Highlight control allows you to adjust the brightness level of the brightest parts of an image. You can select from 61 to 490 by moving the slider.

Click the eyedropper button beneath the slider, and the mouse pointer changes to an eyedropper. Move the eyedropper over the preview image, and click a bright area. The eyedropper "picks up" the color from that area, and uses it as the highlight for the entire image. This effect appears immediately in the preview image. Click Cancel to restore the original image.

Shadow:

The Shadow control allows you to adjust the darkness level of the darkest parts of an image. You can select from 0 to 60 by moving the slider.

Click the eyedropper button beneath the slider, and the mouse pointer changes to an eyedropper. Move the eyedropper over the preview image, and click a dark area. The eyedropper "picks up" the color from that area, and uses it as the shadow for the entire image. This effect appears immediately in the preview image. Click Cancel to restore the original image.

Threshold:

Available only when Image Type is set to Text/Line Art. The scanner scans gray shades as either black or white using this setting.

You can select from 0 (lightest) to 255 (darkest) by moving the slider.

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