♦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.)

♦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.

This option is not available for IPC-4D.

♦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.

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