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♦ Threshold Curve
This option specifies the relationship between the threshold value and the maximum density.
The specification method depends on the [Scan mode] setting.
In [for OCR] mode, use the scroll bar to set the inclination and density level between 0 and
5. Click the arrow of the scroll bar or drag the scroll marker to the desired setting position.
The current setting is displayed in the center (figure on the left).
In [for Image] mode, select [Normal] or [Light] (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 scroll bar is used to set the inclination and density level between 0 and 7.
(The figure on the right is not displayed.)
Some scanner models do not support this function. See "Relevant Image Scanner
Specification" in Appendix.)
♦ 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.)
Some scanner models do not support this function. See "Relevant Image Scanner
Specification" in Appendix.)
♦ 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.
This option is not available for IPC-4D.
Some scanner models do not support this function. See "Relevant Image Scanner
Specification" in Appendix.)