Scanning Techniques | Canon 4.1 guide

S T E P 3

Scanning Techniques

Matching Scan Resolution to Purpose

Plug-in Module CS-U provides many choices of resolution. The resolution you choose should depend upon your output device, the intended purpose of the image, the type of image and your scanner.

It is generally recommended that you scan at a higher resolution than required for output. This ensures that you obtain the best quality image, which can then be reduced with an image editing program to suit specific purposes.

Different types of images require different scan settings. However, increases in scan resolution have a diminishing return after a certain point. For example, a text image can be scanned at 600 dpi for output to a 600 dpi laser printer, while a color image should be scanned at 180 dpi to be output to a color bubble jet printer (360 dpi). To output a color or grayscale image to a bubble jet printer, use a resolution equal to half the resolution of the printer. Set the resolution to 180 dpi, for example, for output on a 360 dpi printer.

•Scan in Black and White mode if you are scanning line art or other items that are Black and White with no shades of gray.

•Scan in Black and White mode if you are scanning a text image for conversion to editable text.

•Scan in 8bit Grayscale mode if you are scanning continuous-tone Black and White photographs, charcoal drawings or originals with shades of gray.

•Scan in 24bit Color mode if you are scanning full-color images, such as photographs or illustrations.

•If you are using an OCR (optical character reader) program in Black and White mode, you are recommended to select a resolution higher than 300 dpi.

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Canon 4.1 manual Scanning Techniques, Matching Scan Resolution to Purpose

Contents

Users Guide When you open the box How to Make Best Use of the Manuals About the Conventions Used in this Guide How to Use this GuideWhere to Look Table of Contents Adjusting Scanned Images Operating Environment Installing Plug-in Module CS-U Pp -20Image Size Control Panel Features E P Scanning Procedures Plug-in Module CS-U Special Features Position materials for scanning and preview them. p Install Plug-in Module CS-UQuick Start Instructions Start Plug-in Module CS-U p Mouse pointer over the image Verify Image Quality with the Browser Function beforeSpecify the Area of the Image to be Scanned Select the area to be scanned by clicking and dragging Save the image with Adobe Photoshop LE or other plug-in Scan the ImageSave the Scanned Image Click on the Scan button E P RGB Values Displaying the Plug-in Module CS-U Control Panel Operating Procedures Place the original on the scanners document glass ProceduresPositioning Originals Click on the Preview button Previewing Selecting the Output Device Output Device Resolution= 720 dpi, Magnification= 100% Setting the Resolution and Magnification Set the desired magnification factor on the control panel To Set the Magnification Factor Setting the Scan Mode Select a scan mode from the pop-up menu Click the arrow beside Scan Mode To Verify the Image Verifying the Image before Scanning Use these buttons to rotate the image Rotating the Image Aspect Ratio Setting PreferencesOutput Device Preview Window Unit Platen/Film Reset Default SettingsShut off lamp time Close Plug-in After Scan Operating Procedures Scanning Position the pointer in the preview window Setting the Scan Area Select the area you want to enlarge with the zoom function Procedures to ZoomZooming Click on the Zoom In button Click close box to guit the Plug-in Module CS-U ScanningTo Initiate the Scan Specify the Scan Area Enter a name for the file and click the Save button Saving Scanned Images Scanning Film Save Exposure Data Auto Exposure Click on the Scan button Remove Dust and Scratches CanoScan D2400U only Bit Color Bit/14/16bit Grayscale and 24-bit/42/48bit ColorBlack & White Tone Adjustment Dialog Tone Adjustment How to Interpret Histograms Histogram Settings How to Adjust Histograms To Adjust a Histogram Shadow Mark Click on the OK button Manipulating the Graph Tone Curve Settings Click the OK button To Edit the Tone Curve Gamma Value = Relationship Between the Tone Curve Image Brightness Brightness Brightness and Contrast SettingsContrast To Adjust the Brightness and Contrast Operating Procedure Adjusting the Color Balance Gamma value Gamma Value SettingsMatching the Gamma Value to the Display Characteristics To Change the Gamma Value Settings To Set the Threshold Value Adjusting the Threshold Value ColorSync Auto Tone CorrectionTo Set the Auto Tone Correction Recommended Open the Image menu and select Unsharp Mask Unsharp Mask Open the Image menu and select Descreen Descreen Select High-speed Scan Mode from the Image menu High-speed Scan Mode Click the Save button Saving/Recalling SettingsTo Save Settings in a Settings File To Recall a Settings File Scanning Techniques Matching Scan Resolution to Purpose Appendices Troubleshooting Problem Scan button cannot be selected Problem Scanning is taking a long time Problem Scanning quality is poor Response Error MessagesError Message Cause Glossary Dot Color Image File Optical ResolutionGrayscale Histogram Preview Area ResolutionPixel Plug-in Software Tone Curve Scan ModeShadows Threshold Value Output device 7, 11, 18, 25 Index Scan 12, 33 Scan area 11 Canon U.S.A., INC Canon Customer Support Help Desk