Canon CS-S 4.3 manual Threshold Setting, Descreen

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CONTENTS

GLOSSARY

INDEX

Chapter 4	49
Scanning Devices
Scanning Devices

Note:	When changing the Paper Size setting, the preview area will
	be cleared and all setting values are reset. When setting the
	preview area size larger than the Paper Size, the preview area
	size will be adjusted to the Paper Size.

Threshold Setting

The Threshold slider can be used to adjust the threshold value (the demarcation between black and white) of black and white images. Images are collection of data assigned varying brightness values. Grayscale and Color images express the brightness with 8 or 12 bit values whereas Black and White images express the brightness with only two values, black (0) and white (255). Accordingly, a point has to be determined either black or white. This point is called the threshold value. By changing the threshold value, you can alter the appearance of image. The default setting is 128.

To adjust threshold value, drag the slider or input the value directly into the box (click the box and type the number from 0 to 255) in FB1200S tab.

Descreen

Moiré patterns occasionally appear when items printed at high resolutions are scanned. To reduce this phenomenon, scan photographs and other high- resolution prints with the descreen activated. Deactivate descreen to scan lower resolution items, such as newspapers, books and magazine text.

•The Descreen is unavailable when the scanning resolution is set for 601 dpi or more.

•Descreen returns to the previous setting when a scanning job is started with a parent software application that cannot display the ScanGear CS-S operation panel.

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Contents UsersGuide Quick Start Guide How to Make Best Use of the ManualsCopyright Notice Contents Scanning Devices Glossary Index Setting Up ScanGear Toolbox CSWelcome to ScanGear CS-S Introduction to ScanGear CS-SSystem Requirements HardwareAbout ScanGear CS-S Windowless Mode Feature ListAbout ScanGear CS-S SoftwareCanon Technical Support About this User’s GuideAssumptions Installing ScanGear CS-S Installing ScanGear CS-SSelecting ScanGear CS-S Where to Go From HereRemoving ScanGear CS-S Next StepsGetting Help in ScanGear CS-S Scanning Using ScanGear CS-S with an ApplicationAbout Scanning Twain InterfaceAcquiring an Image Features of the ScanGear CS-S WindowPreview Area Clear, Preview and Scan Buttons Settings TabsToolbar Status and Message AreasPreparing the Scanner Quick Start to ScanningPreviewing an Image Contents Contents Glossary Index Now you are ready to scan Where is the Scanned Image? Scanning in Windowless UI-less ModeWorking with Preview Images Using the ToolbarChanging the Preview Image Shape and Size Moving an Image Cropping Part of an ImageZooming In and Out Creating a Negative ImageRotating an Image Left or Right Reversing an ImageDisplaying or Hiding the Rulers Selecting Automatic Tone CorrectionSpecifying How the Image is Previewed Setting Scanning Mode Setting Scan Mode, Resolution, and DimensionsTo set scanning mode Selecting a Preset Resolution Selecting Scan ResolutionDeleting a Custom Resolution Selecting a Custom ResolutionChanging a Custom Resolution Selecting Output DimensionsSetting Image Width and Height Setting Units of MeasurementMaintaining Image Proportion Setting Scale About the Tone Tab Settings Setting Image TonesSelecting a Color Channel About the Tone Curve WindowUsing the Auto Tone Setting Adjusting Contrast and Brightness Changing Gamma Curve Values Glossary Index Change Tone Using the Histogram ToolDo one of the following to change the black point Do one of the following Using Preset or Custom CurvesUsing Custom Tone Curves Using Predefined Tone CurvesAbout the Curve Box Select Special Curve list, select Edit custom curve Curve is saved in the location you specify Hints for Editing Custom Tone Curves Opening a Saved Custom Tone CurveUsing Text Enhanced for Scans Setting General PreferencesSelecting Text Enhanced About Canon ColorGear Color Matching Using Canon ColorGearTM Color MatchingSelecting a Monitor Profile Setting Up the Preview Options Configuring a Device with ScanGear CS-S Configuring Scanning DevicesScanning Devices Image SourceDescreen Threshold SettingTest Scanner Shut Off Lamp Time Chapter Scanning DevicesScanning Multi-Page Documents Using the Automatic Document Feeder ADFAbout Scanning Techniques Scanning TechniquesPlanning for the End Result Preparing the Material to ScanMatching Scan Resolution to Purpose Resolution and Color Optical and Enhanced ResolutionsEstimating Image Sizes File Size Estimates Cropping the Image Shape Contrast and Brightness Adjustments Custom Tone AdjustmentsWhat Do Those Curves Mean? Histogram Techniques Gamma AdjustmentsContents Contents Sampling a Tone for the Histogram About Image Color and Color Channels Enhancing Color ImagesContents Glossary Index Installing and Uninstalling ScanGear Toolbox CS Using ScanGear Toolbox CSAbout ScanGear Toolbox CS About the ScanGear Toolbox CS Bar Starting ScanGear Toolbox CSAdding a Button to the ScanGear Toolbox CS Bar Setting Up ScanGear Toolbox CSRemoving a Button from the ScanGear Toolbox CS Bar Enabling or Disabling Easy Acquire Configuring Copy Settings Showing the Copy Button on the ScanGear Toolbox CS Bar Copying Acquired ImagesWith the ScanGear CS-S window open, do the following Configuring Mail Settings Showing the Mail Button on the ScanGear Toolbox CS Bar Linking a Mail ApplicationMailing Acquired Images Linking a Fax Application Configuring Fax SettingsShowing the Fax Button on the ScanGear Toolbox CS Bar Faxing Acquired ImagesConfiguring Edit or Custom Settings Linking an Edit or Custom Application Contents Selecting a ScanGear Toolbox CS Source Changing ScanGear Toolbox CS PreferencesSpecifying ScanGear Toolbox CS Appearance Cleaning Up Temporary FilesUsing ScanGear Toolbox CS Shortcut Menus Canon Monitor Utility Display Canon Scanner MonitorRight-Clicking the Canon Scanner Monitor Icon Copy Image ScanGear Toolbox CS Settings SummaryMail Image Edit or Custom Image Fax ImagePre-Scan Checklist Frequently Asked QuestionsTop Ten List Scanner diagnostics test displays a test failed message Troubleshooting Q & aSome functions are grayed-out Your graphics application cannot find the scannerScanGear CS-S does not launch Parts of images are missing or misaligned Printing or scanning is too slowPreview image is too small on my monitor Automatic document feeder is jammedGlossary Automatic Tone AdjustmentAcquired Images Bits and Bit DepthContents Index Custom Resolutions Curve ChartDefault Color WheelDpi DigitizingDriver Easy AcquireGrainy Gamma CorrectionHeight Histogram ToolLow Contrast Optical ResolutionMid-Point Eyedropper Mid-TonePreset Curves Output DimensionsOutput File Formats Output SizeScan Mode ResolutionScan Resolution Rotate Left/RightSelection Tool System DefaultShortcut Menus SlidersThreshold Text EnhancedTone Tone CurveWhite-Point Eyedropper Units of MeasurementWidth Width-Height RatioIndex 104 105 106 107 108 OE-022AA 0399 CDS Canon Inc