Canon 4.1 manual Histogram Settings, How to Interpret Histograms

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Histogram Settings

The data comprising an image contains a variety of brightness settings ranging from shadows to highlights. These settings are represented in Plug-in Module CS-U by values ranging between 0 and 255. The difference in these values determines the image’s contrast. To show how much of the image data falls into each brightness setting, Plug-in Module CS-U contains a histogram feature that shows this data distribution clearly. With the histogram you can adjust the level of shadows and highlights to achieve beautiful tones with the best possible contrast.

Hint

•You can enhance images with the histogram options only when the image has been previewed in the color or grayscale scan modes.

•You cannot enhance the image with the histogram when ColorSyncTM is selected.

How to Interpret Histograms

You can select the entire image or specify an area for which a histogram will be generated. The height of the peaks of the histogram is directly related to the volume of data with the corresponding value.

Portion with

Highlights

Portion with

Shadows

Entire Image

Distribution of data with a bias toward highlights.

Distribution of data with a bias toward shadows.

Distribution of data widely distributed between shadows and highlights.

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Contents Users Guide When you open the box How to Make Best Use of the ManualsAbout 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-UPp -20Image Size Control Panel FeaturesE P Scanning ProceduresPlug-in Module CS-U Special Features Quick Start Instructions Install Plug-in Module CS-UStart Plug-in Module CS-U p Position materials for scanning and preview them. pSpecify the Area of the Image to be Scanned Verify Image Quality with the Browser Function beforeSelect the area to be scanned by clicking and dragging Mouse pointer over the imageSave the Scanned Image Scan the ImageClick on the Scan button Save the image with Adobe Photoshop LE or other plug-inE P RGB Values Displaying the Plug-in Module CS-U Control PanelOperating Procedures Place the original on the scanners document glass ProceduresPositioning Originals 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 FactorSetting the Scan Mode Select 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 ImageAspect Ratio Setting PreferencesOutput Device Preview Window UnitShut off lamp time Reset Default SettingsClose Plug-in After Scan Platen/FilmOperating Procedures Scanning Position the pointer in the preview window Setting the Scan AreaSelect the area you want to enlarge with the zoom function Procedures to ZoomZooming Click on the Zoom In button To Initiate the Scan ScanningSpecify the Scan Area Click close box to guit the Plug-in Module CS-UEnter a name for the file and click the Save button Saving Scanned ImagesScanning Film Save Exposure Data Auto ExposureClick 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 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 CurveGamma Value = Relationship Between the Tone Curve Image BrightnessBrightness Brightness and Contrast SettingsContrast To Adjust the Brightness and Contrast Operating Procedure Adjusting the Color BalanceGamma 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 ValueTo Set the Auto Tone Correction Auto Tone CorrectionRecommended ColorSyncOpen the Image menu and select Unsharp Mask Unsharp MaskOpen the Image menu and select Descreen DescreenSelect High-speed Scan Mode from the Image menu High-speed Scan ModeClick the Save button Saving/Recalling SettingsTo Save Settings in a Settings File To Recall a Settings File Scanning Techniques Matching Scan Resolution to PurposeAppendices 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 ColorGrayscale Optical ResolutionHistogram Image FilePixel ResolutionPlug-in Software Preview AreaShadows Scan ModeThreshold Value Tone CurveOutput device 7, 11, 18, 25 IndexScan 12, 33 Scan area 11 Canon U.S.A., INC Canon Customer Support Help Desk