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♦ Scanning Parameters
For fine scan adjustments.
Since there is no fixed set of values, set by trial and error.
◊ Brightness:
Sets the brightness of the overall image.
Specify the brightness with a number in the range of 1 (bright) to 255 (dark).
To darken the overall image, increase the value of the setting. To brighten the overall
image, decrease the value.
This parameter can be set if "Halftone" or "Automatic Separation" is selected for
"Image Mode."
◊ Threshold:
Sets the threshold value by which the black and the white of black-and-white images
are distinguished. Specify a number in the range of 1 (bright) to 255 (dark). This
parameter can be set only if "Black & White" is specified for "Image Mode."
In addition, if "DTC mode" is selected, the scanner will automatically use the
appropriate threshold value. As a result, the set value cannot be changed.
If the light color in the scanned document is read as black, increase the threshold value.
To eliminate light- colored areas in the scanned document, decrease this value.
◊ Contrast:
Sets the contrast of light and shadow in a scanned image.
Specify the contrast with a number in the range of 1 (low [soft]) to 255 (high [sharp]).
The contrast can be set if "Gray Scale" is selected in "Image Mode."
If this value is increased, the dark part of the image is shown darker and the light part is
shown lighter.
Some scanner models do not support this function. See "Relevant Image Scanner
Specification" in Appendix.