Canon FB630U, FB636U manual Glossary

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A P P E N D I C E S

Glossary

8-bit Gray Image (Grayscale)

An image created using the 8-bit Grayscale mode. Each dot of the image is allocated 8 bits of data, allowing a single dot to be expressed in one of 256 distinct shades.

24-bit Color Image (Color, High Definition Color)

An image created using the 24-bit Color mode. Each dot of the image is formed by allocating 8 bits of data to each of the red, green and blue (RGB) channels for a total of 24 bits. Each channel can produce up to 256 colors, providing the potential of approximately 16.7 million color tones.

Brightness

The amount of light in an image when it is scanned. Increasing the Brightness setting makes the entire image lighter, and decreasing the Brightness setting makes the entire image darker (p. 44).

Contrast

The degree of difference between the dark and light portions of a document being scanned. Raising the contrast of an image tends to sharpen it, lowering the contrast tends to blur it (p. 44).

Dot

The fundamental element of a letter, object or image. The number of dots per inch (dpi) determines the resolution (or density) of a letter, object or image.

Diffusion Dither

One of the methods used to simulate tones in black and white images. First, the darkness of the original greyscale image is checked and the mid-range tones are judged to be either black or white. Then the difference between the original density and converted density is calculated and black dots are dispersed randomly over the entire image to simulate graduated shading (p. 28).

Gamma Correction

The process whereby variations in color tones from the output of monitors, printers and other output devices are made consistent with the source (input) document. In Plug-in Module CS-U you can use the gamma curve menu setting, or enter a gamma value directly, to set a value to match the gamma value for your monitor. Gamma values are expressed as numbers: 1 is the standard value, numbers lower than 1 brighten the output and numbers higher than one darken the output.

A graph function, the Tone Curve (gamma curve), is also available in Plug-in Module CS-U to make adjustments to gamma values (p. 42).

Gamma Curve

See the entry for Gamma Correction.

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Contents Users Guide Getting Started How to Make Best Use of the ManualsHow to Use this Guide Where to LookAbout the Conventions Used in this Guide Table of Contents Appendices Adjusting and Editing Scanned ImagesControl Panel Features Scanning Preparations p Scanning ProceduresAdjusting and Editing Scanned Images E PSupports 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 on the Browser buttonFolder, file name and file format Scan the Image pClick on the Scan button Save the image with the application software, specifying aE P Installing Plug-in Module CS-U E POperating Environment Click the Install the Software button E P ProceduresClick the Yes button to start the installation E P E P Scanning Preparations Buttons Display Plug-in Module CS-U Control PanelE P Operating Procedures Adobe PhotoDeluxeAdobe Photoshop Previewing Set the original on the scanner document glassClick on the Preview button Unit Set PreferencesE P Setting Basic Resolution E P Preview Window Size Preview Window Settings Dialog BoxSelect the desired option from the pull-down menu Return to Default SettingsE P Calibration Select the Prefs menu in the control panelSet Magnification Output Device Resolution= 360 dpi, Magnification= 100%Set the desired magnification factor on the control panel E P To Set the Magnification FactorGrayscale Mode 8-bit Set Scan ModeBlack and White Mode Line Black and White Mode Diffusion DitherHigh Definition Color Color Mode 24-bitSelect 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 SettingsZooming To ZoomSelect the area you want to enlarge with the zoom function To return to normal view, click the Zoom Out button Click on the Zoom In buttonScanning To Initiate the ScanSpecify the Scan Area To Save an Image Saving Scanned ImagesDiffusion Dither Color ModeGrayscale Mode Black & White ModeUsing the Histogram Feature to Adjust Image Contrast How to Interpret HistogramsHow to Adjust Histograms Click on the OK button E P To Adjust a HistogramClick on the Histogram button Click the Auto buttonSetting the Gamma Adjusting the Image with Gamma SettingsGamma Gamma =Brightness and Contrast Settings ContrastBrightness E P To Adjust the Brightness and Contrast Click the gamma buttonClick the OK button CRT 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 SettingsGamma Value Settings Adjusting the Gamma Value to Match the DisplaySending Output to a Printer Slider Manipulating the Graph Tone Curve SettingsE P To Edit the Tone Curve To Activate the ColorSync Function Auto Tone Correction ColorSyncProcedure DescreenOpen the Image menu and select Descreen 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 ImagesMatching Scan Resolution to Purpose Optical and Enhanced ResolutionsScanning Techniques Specifications Functional SpecificationsSystem Requirements Troubleshooting ProblemClicked on the Plug-in Module CS-U control panel Scan button cannot be selected Response Error MessagesError Message CauseGlossary Scanner ResolutionImage File PreviewIndex P E N D I C E S Helpdesk Canon Customer Support Help DeskOE-030AA 0799 CDS Canon Inc