Operation Manual

9
User Guide – IRIScan
TM
Executive 4
Front/Rear Auto Color Detection:
Click to automatically detect and scan the front or the rear page of your color document in color image
mode. If your document is in color, the scanner will automatically scan the document into a color image.
If your document is non-color, you can choose the output to be either B&W or Gray from the Non-Color
Selection option. This option is useful when you have a mixture of color and non-color document.
Note: If you choose Front Rear Auto Color Detection, you can not specify the image mode of your rear
page and vice versa.
Sensitivity of Auto Color Detection
If your documents contain primarily B&W text and a small amount of light or pale colors and you do not
wish them to be recognized as color image to save the file size, you can reduce the sensitivity value by
moving the bar to the left to let these images to be detected as B&W. The value ranges from 1 to 100. The
default is 37.
2.3.2 Other Image Options
Binarization
This is the process of converting a grayscale or color image to a bi-tonal
image. There are several different methods of performing this conversion.
Options: Dynamic Threshold, Fixed Processing, Halftone 1~5, Error
Diffusion.
Dynamic Threshold: Selecting Dynamic Threshold allows the scanner
to dynamically evaluate each document to determine the optimal threshold
value to produce the highest quality image. This is used to scan mixed
document containing faint text, shaded background, or color background
with a single setting. If Dynamic Threshold is selected, Threshold,
Brightness, and Contrast are not available.
Sensitivity of Dynamic Threshold
Occasionally your scanned image may contain small dots or speckles. To
remove these spots, increase the sensitivity value by moving the bar to the
right. The value ranges from 1 to 30. The default is 20.
Fixed Processing: Used for black-and-white and other high contrast
documents. A single level is set to determine the black-and-white
transition. The threshold is programmable over the entire density range.
Fixed Processing sets Contrast to 0. If Fixed Processing is selected,
Contrast is not available.
Halftone: In addition to the black and white display, Halftone can present a
somehow gray shade of image by using different size of dots. Halftone image
looks like the picture we have seen in the newspaper. Options include
Halftone 1, Halftone 2, Halftone 3, Halftone 4, Halftone 5.
Error Diffusion: Error Diffusion is a type of Halftone. Error Diffusion gives
good image texture and makes text in images more readable than Halftone.
Halftone Image Error Diffusion Image