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Understanding EPSON TWAIN Features

Image Types

Image Type list
Image Type button

Use the Image Type list or button to select the type of image to be scanned.

Image Type list

The Image Type list provides the following predefined settings. EPSON recommends you use the predefined settings first, then later improve the quality of the scanned image manually by making the detailed settings described in the following pages, if necessary. Click the arrows on the right to view all of the available settings.

Color Photo (42-bit):

42-bit color, best quality

This setting is useful when scanning positive or negative film for further editing.

Color Photo:

24-bit color, best quality

This setting is useful when scanning color photo.

Color Document:

24-bit color and best quality with de-screening to remove moiré patterns

This setting is useful when scanning magazines or catalog in color.

Note:

A moiré is a cross-hatch pattern that appears on scanned images when scanning printed material. It is a result of interference that occurs due to the difference between the pitches of the scanning and the halftone screens.

Black & White Photo(14-bit):

14-bit gray, best quality

This setting is useful when scanning positive or negative film for further editing.

Black & White Photo:

8-bit gray, best quality

This setting is useful when scanning black and white photo.

Black & White Document:

8-bit gray, best quality with de-screening to remove moiré patterns

This setting is useful when scanning magazines or catalog in monochrome.

Illustration:

24-bit color, best quality with color smoothing

This setting is useful when scanning large area of solid colors (for example, logos, illustrations, and charts).

Text/Line Art:

Black and white, draft quality

This setting is useful when scanning characters-only documents or line drawings without coloring.

Text (Background Removal):

Black and white, best quality, Text Enhancement Technology

This setting is for OCR (Optical Character Recognition).

Copy & Fax:

Black and white, hard halftone, draft quality, Auto Area Segmentation

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Image Type button

The Image Type button allows you to customize the Image Type settings. If you want to make many detailed settings manually, use this feature.

Click the Image Type button. The following dialog box appears.

Image Type Name:

The names of predefined settings and any custom settings you have saved appear in the Image Type Name list.

Pixel Depth:

Select scanning colors from:

42-bit Color
24-bit Color
14-bit Gray
8-bit Gray
Black & White

Scanning Mode:

Select either Best or Draft scanning quality. Select Best when quality is more important than speed.

De-screening:

Select either On or Off. When On is selected, moiré patterns are automatically removed from scanned images, but scanning takes longer.

Color Smoothing

Select either On or Off. When On is selected, colors in an image are related to limited number of index colors. This is useful when scanning large areas of solid colors (for example, logos, illustrations, and charts).

Note:

The pixel depth of output image is 24-bit color.

Color Smoothing is available only when Pixel Depth is set to 24-bit color.

Auto Exposure Option:

Select either Photo or Document. You can see the effects of the Auto Exposure Option setting in the Preview window when you click the Auto Exposure button.

Dropout:

Select a color to subtract from a black and white scan of a colored original. Proper use of dropout can improve the quality of your black and white scans. Available dropout options are:
None, Red, Green, and Blue.

Note:

Dropout is available only when Pixel Depth is set to 14-bit Gray, 8-bit Gray, or Black & White.

Depending on the image you scan, you may need to adjust the Threshold setting in the Image Controls dialog box to enable this feature.

B/W Option:

Select from:
Text Enhancement Technology, Auto Area Segmentation, or None.

Text Enhancement Technology (TET)
To improve recognition accuracy during OCR (Optical Character Recognition) scanning, select this option. This function eliminates the document background from scans.

Auto Area Segmentation (AAS)
To make grayscale images clearer and text recognition more accurate, select this option. This function separates text from graphics.

Note:

B/W Option is available only when Pixel Depth is set to Black & White.

When you need neither TET nor AAS, select None.

Halftone:

Select a halftone or dither setting to reproduce images using special dot patterns:

Mode A (Hard Tone)
Mode B (Soft Tone)
Mode C (Net Screen)
Dither A (4 x 4 Bayer)
Dither B (4 x 4 Spiral)
Dither C (4 x 4 Net Screen)
Dither D (8 x 4 Net Screen)
None

Note:

Halftone is available only when Pixel Depth is set to Black & White.

To save the settings you made as a group of custom settings, type a new name in the Image Type Name box, then click Save.

To delete an Image Type setting, select the setting name to be deleted in the Image Type Name menu, then click Delete.

To apply the settings you made, click OK. The Preview window displays the effects of the current settings except for De-screening, Text Enhancement Technology (TET) and Auto Area Segmentation (AAS) settings.

To cancel the settings, click Cancel.

To access the online help, click Help.

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