Canon N656U Setting the Scan Mode, Black and White, Grayscale, Color Documents, Color Photos

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Setting the Scan Mode

When an image is scanned, it is read as a collection of “dots.” The scan mode that is selected determines how each of these dots is represented in the output. The following four scan modes are available.

Black and White

Expresses images in two colors only: black or white. A dot is expressed as either black or white according to its brightness level and the value set as the threshold value, which can be freely set. Select this mode to output to a monochrome printer.

Grayscale

Expresses images in 256 shades of gray. Select this mode to scan black and white photographs or create monochrome images from color images.

Color (Documents)

By scanning more slowly than the Color (Photos) mode, this mode reproduces fine text or lines in greater detail. Select this mode to scan color documents with fine print or graphics. Scanning in this mode takes approximately twice as long as in the Color (Photos) mode.

Color (Photos)

Expresses each color channel (RGB) in 256 shades (8 bit). Select this mode to scan standard color photographs.

Hint

Scanning the same image in the four different scan modes produces different file sizes. By size, black and white mode requires the least disk space, followed in order by the grayscale and the color modes. Before scanning, check the data volume indicated on the control panel.

The numerator indicates the amount of disk space required for the scanned image while the denominator indicates the amount of disk space available. When the required space exceeds the available space, the scan button is unavailable.

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Contents Users Guide When you open the box How to Make Best Use of the ManualsHow to Use this Guide Where to LookAbout the Conventions Used in this Guide Table of Contents Adjusting Scanned Images Operating Environment Installing Plug-in Module CS-UImage Size pp Control Panel FeaturesE P Scanning ProceduresSee the Results of Adjustments Immediately Dynamic Preview Plug-in Module CS-U Special FeaturesGamma Curve Adjusts Image Brightness ColorSync Ver 2.0 + Compatible for Auto Tone CorrectionQuick Start Instructions Install Plug-in Module CS-UStart Plug-in Module CS-U Position materials for scanning and preview themSpecify the Area of the Image to be Scanned Verify Image Quality with the Browser Function beforeClick on the Browser button Selection frame will appear Select the area to be scanned by clicking and draggingSave the Scanned Image p Scan the Image pE P RGB Values Displaying the Plug-in Module CS-U Control PanelOperating Procedures Procedures Positioning OriginalsPlace the original on the scanners document glass Click on the Preview button PreviewingSelecting the Output Device Output Device Resolution= 720 dpi, Magnification= 100% Setting the Resolution and MagnificationSet the desired magnification factor on the control panel To Set the Magnification FactorBlack and White Setting the Scan ModeGrayscale Color DocumentsSelect a scan mode from the pop-up menu Click the arrow beside Scan ModeTo Verify the Image Verifying the Image before ScanningUse these buttons to rotate the image Rotating the ImageSetting Preferences Output DeviceAspect Ratio Preview Window UnitReset Default Settings CalibrationClose Plug-in After Scan Operating Procedures Scanning Position the pointer in the preview window Setting the Scan AreaProcedures to Zoom ZoomingSelect the area you want to enlarge with the zoom function Click on the Zoom In button To Initiate the Scan ScanningSpecify the Scan Area Click on the Scan buttonEnter a name for the file and click the Save button Saving Scanned ImagesGrayscale, Color Photos and Color Documents Black & WhiteColor Photos and Color Documents Tone Adjustment Dialog Tone AdjustmentHow to Interpret Histograms Histogram SettingsHow to Adjust Histograms To Adjust a HistogramShadow Mark Click on the OK buttonManipulating the Graph Tone Curve SettingsClick the OK button To Edit the Tone CurveValue = Relationship Between the Tone Curve Image BrightnessBrightness and Contrast Settings ContrastBrightness To Adjust the Brightness and Contrast Operating Procedure Adjusting the Color BalanceGamma Value Settings Matching the Gamma Value to the Display CharacteristicsGamma value To Change the Gamma Value Settings To Set the Threshold Value Adjusting the Threshold ValueTo Set the Auto Tone Correction Auto Tone CorrectionStandard ColorSyncOpen the Image menu and select Unsharp Mask Unsharp MaskOpen the Image menu and select Descreen DescreenSaving/Recalling Settings To Save Settings in a Settings FileClick the Save button To Recall a Settings File Matching Scan Resolution to Purpose Optical and Enhanced ResolutionsScanning Techniques Appendices Troubleshooting Problem Scan button cannot be selected Error Message Error MessagesCause ResponseAuto Tone Correction GlossaryBits/Bit Numbers Black Eyedropper ToolDot Color ChannelHistogram Image FileMagnification Resolution Optical ResolutionMoiré PixelShadows Scan ModeThreshold Value Tone CurveOutput device 7, 11, 18, 25 IndexPage Canon Computer SYSTEMS, INC Canon Customer Support Help DeskOE-040AA 052000 CDS Canon Inc