Canon ImageCLASS MF4690, Руководство пользователя

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Introduction
Scanning a
Document
Troubleshooting
Appendix
Table of Contents
Index
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Tone Curve/Threshold Drop-Down List
This drop-down list enables you to save a set of color settings
made for the focal cropping frame. If there are no cropping
frames, settings for the whole preview area are saved.
You can also recall the saved settings and apply them to the
selected frames or the whole preview area.
[Threshold Level] Adjust the threshold by moving the slider
or entering a value (0 to 255).
[Reset] Resets the current setting to the default
value.
NOTE
The brightness of color and grayscale images are expressed as a
value between 0 and 255 but the brightness of black and white
images is expressed in terms of either black or white, including
the parts of an image which are a color between the two. The
boundary at which black and white is divided is called “threshold”.
[Custom] When this option is selected, specify a value
for each color setting. Even after the
registered settings are applied, [Custom]
resumes automatically if you change any
setting or make adjustments to the selected
cropping frame.
[Add/Delete] Opens the [Add/Delete Tone Curve Settings]
dialog box ([Add/Delete Threshold Settings]
dialog box, when [Black and White] is
selected in [Color Mode]). This dialog box
enables you to name and register a set of
color settings.