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♦ Density curve
This option specifies the relationship between the threshold value and the maximum density.
This specification method depends on the [Scan mode] setting.
In [for OCR] mode, use the slider to set the inclination and density level. To specify the
value, drag the tab of the slider to the desired setting position. The current setting value is
displayed on the right. (figure on the left)
In [for Image] mode, select [Normal] or [Lightest]. (figure on the right)
If IPC-3/3D and IPC-4D have been installed, there is no difference between [for OCR] and
[for Image]. The slider is used to set the inclination and density level. (The figure on the
right is not displayed.)
♦ Gamma Curve
This option specifies the gamma correction curve pattern.
The available choices depend on the [Scan mode] setting.
In [for OCR] mode, select [OCR1] or [OCR2].
In [for Image] mode, select [Dark Image] or [Even].
For IPC-3/3D and IPC-4D, the gamma curve need not be specified because the contrast is
adjusted automatically. ([Gamma Curve] is not displayed.)
♦ Equal to White
At conversion to binary, this option specifies whether to set the data to black or white when
the threshold value and the value of the scanned data are equal.
When using IPC-4D, this option cannot be selected.
♦ Ball-Point Pen Mode
When an image made with a pencil or ball-point pen is scanned, the light reflected from the
pencil lead or ink is not uniform. As a result, part of the image may be missing. If the [Ball-
Point Pen] checkbox is checked, filtering is applied to offset the bright area in the document
and compensate for disconnected or faint lines.