Canon imageCLASS MF4150 MF4100 Series Scanner Driver Guide - Page 47

Tone Curve/Threshold Drop-Down List, Opens the [Add/Delete Tone Curve Settings]

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Introduction 1 Scanning a Document 2 Troubleshooting 3 Appendix 4 [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". Back Previous Next TOP ● 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. [Custom] [Add/Delete] 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. 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. Table of Contents Index 2-34

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1
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TOP
Back
Previous
Next
2-34
Introduction
Scanning a
Document
Troubleshooting
Appendix
Table of Contents
Index
●
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.