Canon FB630U/FB636U manual Procedure, Open the Image menu and select Descreen

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S T E P 3

Descreen

Moiré patterns occasionally appear when items printed at low resolutions are scanned. Moiré patterns are dot-like patterns that interfere with processing images for professional use and are usually caused by poor dithering resulting from scanning images from newspapers, books, magazines, etc. To reduce this phenomenon, scan photographs and other low-resolution prints with the descreen activated. Shut it off to scan higher resolution items. The default setting is “off”.

Caution

• The Descreen cannot be switched on for scanning resolutions higher than 601 dpi.

•The previous setting is enabled for the Descreen when Plug-in Module CS-U is opened by a software application operating in the windowless mode.

Procedure

Open the [Image] menu and select [Descreen].

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Contents User’s Guide This page intentionally left blank About the Conventions Used in this Guide How to Use this GuideWhere to Look Table of Contents Appendices Control Panel Features E P Scanning ProceduresSupports ColorSync 2.0 or higher Auto Tone Correction Plug-in Module CS-U Special FeaturesSee the Results of Adjustments Immediately Dynamic Preview Gamma Curve Adjusts Image BrightnessStart the Preview Scan Installing Plug-in Module CS-UQuick Start Instructions Start Plug-in Module CS-USelect the area to be scanned by clicking and dragging Set the preferences, magnification and scan mode settingsSpecify the Area of the Image to be Scanned p Click the Browser buttonFolder, file name and file format Scan the Image pClick the Scan button Save the image with the application software, specifying aE P E P Display Plug-in Module CS-U Control PanelCanon Photo E P Operating ProceduresClick the Preview button PreviewingSet the original on the scanner document glass Unit Set PreferencesE P Setting Basic Resolution E P Preview Window Size Preview Window Settings Dialog BoxSelect the Prefs menu in the control panel Return to Default SettingsProcedures E P CalibrationSet Magnification Output Device Resolution= 360 dpi, Magnification= 100%Set the desired magnification factor on the control panel E P To Set the Magnification FactorGrayscale Set Scan ModeBlack & White Diffusion DitherHigh Definition Color ColorSelect the scan mode that you want To Set the Scan ModeTo Verify the Image Verify Image Before ScanningE P Scanning Position the pointer in the preview window Scan Area SettingsSelect the area you want to enlarge with the zoom function ZoomingTo Zoom To return to normal view, click the Zoom Out button Click the Zoom In buttonSpecify the Scan Area ScanningTo Initiate the Scan To Save an Image Saving Scanned ImagesDiffusion Dither Color/High Definition ModeGrayscale Mode Black & White ModeHow to Adjust Histograms Using the Histogram Feature to Adjust Image ContrastHow to Interpret Histograms Click the OK button E P To Adjust a HistogramClick the Histogram button Click the Auto buttonSetting the Gamma Adjusting the Image with Gamma SettingsGamma Gamma =Brightness Brightness and Contrast SettingsContrast Click the Gamma button E P To Adjust the Brightness and ContrastCRT Type C Adjusting Gamma with the MenuCRT Type a CRT Type BClick the radio button for Menu Setting E P To Change the Gamma Value SettingsSending Output to a Printer Gamma Value SettingsAdjusting the Gamma Value to Match the Display Slider Manipulating the Graph Tone Curve SettingsE P To Edit the Tone Curve To Activate the ColorSync Function Auto Tone Correction ColorSyncOpen the Image menu and select Descreen ProcedureDescreen Set the threshold value in the Control Panel To Set the Threshold ValueTo Save Settings in a Settings File Saving / Recalling SettingsE P To Recall a Settings File Many special effects may be achieved with filters Editing Scanned ImagesScanning Techniques Matching Scan Resolution to PurposeOptical and Enhanced Resolutions System Requirements SpecificationsFunctional Specifications Clicked on the Plug-in Module CS-U control panel TroubleshootingProblem Scan button cannot be selected Response Error MessagesError Message CauseGlossary Scanner ResolutionImage File PreviewIndex P E N D I C E S Mail support via Canon Computer Systems, Inc Canon Customer Care CenterOE-030AA 0799 CDS Canon Inc