Canon CS-S 4.3 manual Matching Scan Resolution to Purpose

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CONTENTS		Chapter 5	54
		Scanning Techniques
GLOSSARY

INDEX

• Although it may seem obvious, it is important to line up the original

as straight as possible so you do not have to make adjustments in the scan.

• If you plan to rotate the image in the ScanGear CS-S preview window or in the acquiring software, try positioning the image so it is already rotated before the scan.

Matching Scan Resolution to Purpose

ScanGear CS-S provides many choices for resolution. What resolution you choose depends on your output device, how you want to use the image, the type of image, and your scanner.

In general, it is recommended that you scan the image at a higher resolution than you need. That way, you retain the amount of information in the image, and if necessary you can reduce the resolution in the imaging application, after the image has been scanned and acquired.

Different types of images need different types of scan settings. However, after a certain point, increases in scan resolution will not improve the output image quality. For example, a text image can be scanned at 600 dpi for output to a 600 dpi laser printer, but a color image should be scanned at 180 dpi to be output to a color BJ-printer. When the image is output to a Bubble jet printer in the color or gray mode, for example, the basic resolution of the printer is halved. For example, for a 360 dpi printer the basic resolution is set for 180 dpi.

•If your image is black and white with no shades of gray, such as line art, scan in Black and White mode.

•If you are scanning a text image for conversion to a text file, scan in Text Enhanced mode.

•If you are scanning continuous-tone black and white photographs, charcoal drawings, or any original with shades of gray, scan in Grayscale mode.

•For full-color images, such as photographs or illustrations, scan in Color mode.

•For example, with OCR applications using Black and White scan mode, more than 300 dpi is the recommended scan resolution.

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Contents UsersGuide How to Make Best Use of the Manuals Quick Start GuideCopyright Notice Contents Scanning Devices Setting Up ScanGear Toolbox CS Glossary IndexSystem Requirements Introduction to ScanGear CS-SWelcome to ScanGear CS-S HardwareAbout ScanGear CS-S Feature ListAbout ScanGear CS-S Windowless Mode SoftwareAbout this User’s Guide Canon Technical SupportAssumptions Installing ScanGear CS-S Installing ScanGear CS-SRemoving ScanGear CS-S Where to Go From HereSelecting ScanGear CS-S Next StepsGetting Help in ScanGear CS-S About Scanning Using ScanGear CS-S with an ApplicationScanning Twain InterfaceFeatures of the ScanGear CS-S Window Acquiring an ImagePreview Area Toolbar Settings TabsClear, Preview and Scan Buttons Status and Message AreasQuick Start to Scanning Preparing the ScannerPreviewing an Image Contents Contents Glossary Index Now you are ready to scan Scanning in Windowless UI-less Mode Where is the Scanned Image?Using the Toolbar Working with Preview ImagesChanging the Preview Image Shape and Size Zooming In and Out Cropping Part of an ImageMoving an Image Creating a Negative ImageDisplaying or Hiding the Rulers Reversing an ImageRotating an Image Left or Right Selecting Automatic Tone CorrectionSpecifying How the Image is Previewed Setting Scan Mode, Resolution, and Dimensions Setting Scanning ModeTo set scanning mode Selecting Scan Resolution Selecting a Preset ResolutionSelecting a Custom Resolution Deleting a Custom ResolutionSelecting Output Dimensions Changing a Custom ResolutionSetting Units of Measurement Setting Image Width and HeightMaintaining Image Proportion Setting Scale Setting Image Tones About the Tone Tab SettingsAbout the Tone Curve Window Selecting a Color ChannelUsing the Auto Tone Setting Adjusting Contrast and Brightness Changing Gamma Curve Values Change Tone Using the Histogram Tool Glossary IndexDo one of the following to change the black point Using Preset or Custom Curves Do one of the followingUsing Predefined Tone Curves Using Custom Tone CurvesAbout the Curve Box Select Special Curve list, select Edit custom curve Curve is saved in the location you specify Opening a Saved Custom Tone Curve Hints for Editing Custom Tone CurvesSetting General Preferences Using Text Enhanced for ScansSelecting Text Enhanced Using Canon ColorGearTM Color Matching About Canon ColorGear Color MatchingSelecting a Monitor Profile Setting Up the Preview Options Scanning Devices Configuring Scanning DevicesConfiguring a Device with ScanGear CS-S Image SourceThreshold Setting DescreenTest Scanner Chapter Scanning Devices Shut Off Lamp TimeUsing the Automatic Document Feeder ADF Scanning Multi-Page DocumentsPlanning for the End Result Scanning TechniquesAbout Scanning Techniques Preparing the Material to ScanMatching Scan Resolution to Purpose Optical and Enhanced Resolutions Resolution and ColorEstimating Image Sizes File Size Estimates Cropping the Image Shape Custom Tone Adjustments Contrast and Brightness AdjustmentsWhat Do Those Curves Mean? Gamma Adjustments Histogram TechniquesContents Contents Sampling a Tone for the Histogram Enhancing Color Images About Image Color and Color ChannelsContents Glossary Index Using ScanGear Toolbox CS Installing and Uninstalling ScanGear Toolbox CSAbout ScanGear Toolbox CS Starting ScanGear Toolbox CS About the ScanGear Toolbox CS BarSetting Up ScanGear Toolbox CS Adding a Button to the ScanGear Toolbox CS BarRemoving a Button from the ScanGear Toolbox CS Bar Enabling or Disabling Easy Acquire Configuring Copy Settings Copying Acquired Images Showing the Copy Button on the ScanGear Toolbox CS BarWith the ScanGear CS-S window open, do the following Configuring Mail Settings Linking a Mail Application Showing the Mail Button on the ScanGear Toolbox CS BarMailing Acquired Images Configuring Fax Settings Linking a Fax ApplicationFaxing Acquired Images Showing the Fax Button on the ScanGear Toolbox CS BarConfiguring Edit or Custom Settings Linking an Edit or Custom Application Contents Changing ScanGear Toolbox CS Preferences Selecting a ScanGear Toolbox CS SourceCleaning Up Temporary Files Specifying ScanGear Toolbox CS AppearanceUsing ScanGear Toolbox CS Shortcut Menus Canon Scanner Monitor Canon Monitor Utility DisplayRight-Clicking the Canon Scanner Monitor Icon ScanGear Toolbox CS Settings Summary Copy ImageMail Image Fax Image Edit or Custom ImageFrequently Asked Questions Pre-Scan ChecklistTop Ten List Troubleshooting Q & a Scanner diagnostics test displays a test failed messageYour graphics application cannot find the scanner Some functions are grayed-outScanGear CS-S does not launch Printing or scanning is too slow Parts of images are missing or misalignedAutomatic document feeder is jammed Preview image is too small on my monitorAcquired Images Automatic Tone AdjustmentGlossary Bits and Bit DepthContents Index Default Curve ChartCustom Resolutions Color WheelDriver DigitizingDpi Easy AcquireHeight Gamma CorrectionGrainy Histogram ToolMid-Point Eyedropper Optical ResolutionLow Contrast Mid-ToneOutput File Formats Output DimensionsPreset Curves Output SizeScan Resolution ResolutionScan Mode Rotate Left/RightShortcut Menus System DefaultSelection Tool SlidersTone Text EnhancedThreshold Tone CurveWidth Units of MeasurementWhite-Point Eyedropper Width-Height RatioIndex 104 105 106 107 108 OE-022AA 0399 CDS Canon Inc