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User Guide IRIScan
TM
Executive 4
Threshold
Used to convert a grayscale image to a bi-tonal image. The value ranges from 0
to 255. A low threshold value produces a lighter image, and can be used to
subdue backgrounds and subtle, unneeded information. A high threshold value
produces a darker image, and can be used to help pick up faint images.
Adjust the threshold setting by dragging the Threshold sliding bar to the left or
right to achieve the desired threshold setting.
200 dpi,
Threshold:50,
Brightness: 0
200 dpi,
Threshold:100,
Brightness: 0
Gray
Document Type: Choice: Normal, Photo, Document
Three options of document type are provided when you choose Gray as the image type for your scanned
document. Choice: Normal, Photo, Document.
Document: Choose Document if your original contains pure text or a mixture of text and graphic
since it is an optimal setting for regular business document. When using Document, only Threshold
can be adjusted.
Photo: Choose Photo if your original contains photo to reproduce your photo in vivid grayscale image.
When using Photo, no Threshold and Contrast can be adjusted.
Normal: When using Normal, Threshold, Brightness, and Contrast can be adjusted.
Threshold: The value ranges from 0 to 255. The default is 230. A low threshold value produces a lighter
image, and can be used to subdue backgrounds and subtle, unneeded information. A high threshold value
produces a darker image, and can be used to help pick up faint images. Adjust the threshold setting by
dragging the Threshold sliding bar to the left or right to achieve the desired threshold setting.
Normal
Photo
Document
(Threshold: 230)
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