Chapter 3. MiraScan

3.4 Combo Box Group
Combo boxes allow you to select Image Type, Original, Scan Mode, Resolution, Scale, Descreen and Color Wizard.

Image Type
The Image Type combo box is used to select particular data type for your scan. The effect of each item is described below.

Color
Each pixel of a photo image occupies 24 bits (8 bits for Red, 8 bits for Green and 8 bits for Blue). A total of 16,777,216 colors can be represented.

Gray
Each pixel of a photo image occupies 8 bits. A total of 256 gray levels can be represented.

Line Art
Each pixel of a text image occupies 1 bit. A total of 2 gray levels, i.e., black and white, can be represented. Each bit set on or off is determined by a threshold value. The threshold value can be set inside the Text Threshold dialog box.

Halftone
You can specify the halftone pattern by clicking the menu item Halftone Pattern of the Image menu if you select this image type. Each pixel of a normal halftone image occupies 1 bit.


Original
The Original combo box is used to select the scan source document type.

Reflective
Select Reflective for paper original. This type is the default.


Scan Mode
Scan Mode allows you to specify the scan method.

High Speed
For High Speed scanning, the scanning module will traverse only once for color images.

High Quality
For High Quality scanning, the scanning module will traverse only once for color images. It takes a few more seconds than high speed mode for higher quality scanning.


Resolution
The resolution combo box allows you to specify the horizontal and vertical resolutions of a scanned picture. When resolution changes, so does the scaling range. The higher the resolution, the smaller the maximum scaling.
The unit of resolution is dpi (dots per inch). You may select resolution from the list. To invoke the Custom Resolution dialog box shown below, you may also select the Custom... item.

Non-uniform resolution can be set by adjusting the X (Horizontal) and Y (Vertical) parameters independently, which creates various kinds of aspect ratio. Select the Sync Box check box to maintain the aspect ratio to 1, which keeps the original shape of the document.


Scale
The scale combo box lets you specify the horizontal and vertical scaling of the scanned picture. Note that the maximum and minimum scale values are subject to resolution values.

The scale unit is percentage (%). You may select scale from the list. The value selected applies to horizontal and vertical coordinates. You may also select the Custom... item to invoke the Custom Scale dialog box below.

Non-uniform scale can be set by adjusting the X (Horizontal) and Y (Vertical) parameters independently, which creates various kinds of aspect ratio. Select the Sync Box check box to maintain the aspect ratio to 1, which keeps the original shape of the document.


Descreen
Here you can select the descreen function . To see more detailed description, please refer to the Descreen at section 3.2 Effect Menu.


Color Wizard
You can select the color enhancement function from the color wizard. To see more detailed description, please refer to the Color Wizard at section 3.2 Effect Menu.