Canon 4.1 Scan Mode, Shadows, Threshold Value, Tone Curve, Unsharp Mask, White Eyedropper Tool

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Scan Mode

Any one of the various methods used to reproduce image data. Scan modes are distinguished by the number of bits used to describe each pixel. Plug-in Module CS-U features the following scan modes.

•24 bit Color: assigns 8 bits of data for each color channel (RGB) in each pixel. Each pixel is therefore assigned 24 bits.

•42/48 bitColor: While the Color mode scans at 8 bits per RGB channel, this mode scans at 14 or 16 bits per channel to achieve a particularly high-quality image. Each pixel is expressed with 42 or 48 bits of data.

•8 bit Grayscale: assigns 8 bits of data to its single color channel. Each pixel is therefore assigned 8 bits.

•14/16 bit Grayscale: While the Grayscale mode scans at 8 bits, this mode scans at 14 or 16 bits to achieve a particularly high-quality image. Each pixel is expressed with 14 or 16 bits of data.

•Black and White: assigns 1 bit of data to each pixel.

Scanning

The process of using a scanner to read image data. Scanned data is sent to the computer as image data.

Shadows

The darkest portions of an image scanned in a color or grayscale image mode.

Threshold Value

The dividing value at which a pixel is determined to be either black or white when the image is reproduced as a black and white image. The higher the threshold, the darker the image. The lower the threshold, the brighter the image.

Tone Curve

A function used to adjust image brightness. The tone curve (or gamma curve) is a graphic representation of the relationship of the input from the scanner to the output to the monitor or printer.

Unsharp Mask

A function that sharpens image outlines. Makes an image appear naturally sharper without changing the brightness, contrast or color balance.

White Eyedropper Tool

Tool used to the select the brightest portion of an image in the preview area. Used with the Histogram function to adjust image brightness. When this tool is clicked on the image, all areas that are brighter are set to pure white.

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Contents Users Guide How to Make Best Use of the Manuals When you open the boxWhere to Look How to Use this GuideAbout the Conventions Used in this Guide Table of Contents Adjusting Scanned Images Installing Plug-in Module CS-U Operating EnvironmentControl Panel Features Pp -20Image SizeScanning Procedures E PPlug-in Module CS-U Special Features Start Plug-in Module CS-U p Install Plug-in Module CS-UQuick Start Instructions Position materials for scanning and preview them. pSelect the area to be scanned by clicking and dragging Verify Image Quality with the Browser Function beforeSpecify the Area of the Image to be Scanned Mouse pointer over the imageClick on the Scan button Scan the ImageSave the Scanned Image Save the image with Adobe Photoshop LE or other plug-inE P Displaying the Plug-in Module CS-U Control Panel RGB ValuesOperating Procedures Positioning Originals ProceduresPlace the original on the scanners document glass Previewing Click on the Preview buttonSelecting the Output Device Setting the Resolution and Magnification Output Device Resolution= 720 dpi, Magnification= 100%To Set the Magnification Factor Set the desired magnification factor on the control panelSetting the Scan Mode Click the arrow beside Scan Mode Select a scan mode from the pop-up menuVerifying the Image before Scanning To Verify the ImageRotating the Image Use these buttons to rotate the imageOutput Device Setting PreferencesAspect Ratio Unit Preview WindowClose Plug-in After Scan Reset Default SettingsShut off lamp time Platen/FilmOperating Procedures Scanning Setting the Scan Area Position the pointer in the preview windowZooming Procedures to ZoomSelect the area you want to enlarge with the zoom function Click on the Zoom In button Specify the Scan Area ScanningTo Initiate the Scan Click close box to guit the Plug-in Module CS-USaving Scanned Images Enter a name for the file and click the Save buttonScanning Film Auto Exposure Save Exposure DataClick on the Scan button Remove Dust and Scratches CanoScan D2400U only Black & White Bit/14/16bit Grayscale and 24-bit/42/48bit ColorBit Color Tone Adjustment Tone Adjustment DialogHistogram Settings How to Interpret HistogramsTo Adjust a Histogram How to Adjust HistogramsClick on the OK button Shadow MarkTone Curve Settings Manipulating the GraphTo Edit the Tone Curve Click the OK buttonRelationship Between the Tone Curve Image Brightness Gamma Value =Contrast Brightness and Contrast SettingsBrightness To Adjust the Brightness and Contrast Adjusting the Color Balance Operating ProcedureMatching the Gamma Value to the Display Characteristics Gamma Value SettingsGamma value To Change the Gamma Value Settings Adjusting the Threshold Value To Set the Threshold ValueRecommended Auto Tone CorrectionTo Set the Auto Tone Correction ColorSyncUnsharp Mask Open the Image menu and select Unsharp MaskDescreen Open the Image menu and select DescreenHigh-speed Scan Mode Select High-speed Scan Mode from the Image menuTo Save Settings in a Settings File Saving/Recalling SettingsClick the Save button To Recall a Settings File Matching Scan Resolution to Purpose Scanning TechniquesAppendices Troubleshooting Problem Scan button cannot be selected Problem Scanning is taking a long time Problem Scanning quality is poor Error Message Cause Error MessagesResponse Glossary Color DotHistogram Optical ResolutionGrayscale Image FilePlug-in Software ResolutionPixel Preview AreaThreshold Value Scan ModeShadows Tone CurveIndex Output device 7, 11, 18, 25Scan 12, 33 Scan area 11 Canon Customer Support Help Desk Canon U.S.A., INC