Canon scanner CanoScan N1220U User Manual
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81 chapter 7 Troubleshooting Top Page Glossary Contents Index The colors differ between the Preview and the Print Problem:When printing the image, its color differ from the one in the Preview area. Cause1:The toner of the printer is going short. Solution:Confirm the toner of the printer. Cause2:Canon ColorGear Color Matching may have not been selected when it was necessary. Solution:Check that Canon ColorGear Color Matching is selected on the Preferences sheet. Cause3:The settings of the printer driver, such as color balance or Gamma, do not match to the printer. Solution1:Adjust the color balance in the printer driver manually. Solution2:Change the Gamma value setting of the printer driver. The software application cannot find the scanner. Problem:When trying to scan, an error message says the scanner cannot be found. Cause:Windows may not recognize your scanner. Solution:Make sure the scanner is connected to your computer before you turned on the computer and started Windows. If not, connect the scanner. Then restart your computer. If this does not correct the problem, consult the scanner user manual for additional information about how to properly set up your scanner. Some buttons are grayed-out. Problem:Buttons in the Toolbar are grayed-out and not available. Cause:Some functions are not available until an image has been previewed. Solution:Preview an image.
82 chapter 7 Troubleshooting Top Page Glossary Contents Index ScanGear CS-U does not launch. Problem:ScanGear CS-U does not launch, the screen freezes, or another software application launches. Cause:The scanner may not be connected correctly, or you may have chosen the wrong scanner source in your software application. The scanner configuration file may have been changed. Solution:Make sure the scanner is properly connected to your computer before you turn on the computer and start Windows. If not, connect the scanner. Then restart your computer. Make sure you selected the correct scanner in the parent software application. For details, see your software application documentation for instructions. If neither of those steps solve the problem, uninstall ScanGear CS-U (p.16) then reinstall ScanGear CS-U (p.13).
83 chapter 7 Troubleshooting Top Page Glossary Contents Index Scanning is too slow. Problem:The scanner is taking an unusually long time to print or scan. Cause:The selected output resolution of the image may be too high for the resolution of your printer, or your computer may be low on memory. Solution:Before scanning the image, make sure you have set the Scan Resolution on the Main tab to not exceed the resolution of your printer. Also check to see if there is enough memory available in your computer. Before scanning, quit other applications that are not in use. Parts of images are missing or not aligned. Problem:Some characters are missing from the image in the Preview Area, or the image is not aligned in the Preview Area. Cause:The page has been placed on the scanner improperly. Solution:Check the scanner and place the original correctly to adjust the image. Image is too light or too dark compared to the original. Problem:Scanned or printed image is much lighter or darker than the original. Cause:Image and color adjustments may not have been set properly. Solution:The best solution is to scan the image using all default settings again. Then make imaging and color adjustments as necessary.
84 chapter 7 Troubleshooting Top Page Glossary Contents Index The preview image is too small on the monitor Problem:The image in the Preview Area is very small, and cannot be viewed in the Preview Area for adjustment. Cause:If you have a high-resolution setting on your monitor, the ScanGear CS-U window is smaller than if you had a lower- resolution setting. Solution:Drag the Window Resize Corner (p.26) on the lower right of the ScanGear CS-U window to enlarge the entire window or lower your monitors resolution with the Control Panel.
86 Glossary Top Page Glossary Contents Index Acquired Images Images sent from your scanner software to the host graphics application. Auto Crop After you select an area of the screen by clicking the Crop button and dragging a rectangle around the object or text you want to crop, click the Auto Crop button to size the rectangle exactly to the size of the object or block of text enclosed in the rectangle. Auto Tone Adjustment Automatic analysis and adjustment of the image using Contrast/ Brightness and Gamma settings. Automatic Preview When the automatic preview feature is switched on, the original on the scanner is pre-scanned immediately as ScanGear CS-U is launched from the parent software application. To switch this feature on and off, open the Preferences sheet for your scanner and click the button for “Automatically execute a preview”. (p.74) Bits and Bit Depth A bit (Binary digit) is the smallest possible unit of information on a computer; it represents yes or no; on or off; 1 or 0. Bit Depth is used to describe the complexity of a graphic image. One-bit, or bi-level, images are black and white. This is the Black and White setting in ScanGear CS-U. Eight-bit grayscale uses 256 shades of gray to accurately represent most black and white photographs or gray interpretations of color images. This is the Grayscale setting in ScanGear CS-U. Twenty-four-bit color, also called True Color, uses three eight-bit channels, one channel each for Red, Green and Blue, to create up to 16.7 million colors. This is the Color setting in ScanGear CS-U.
87 Glossary Top Page Glossary Contents Index Black-point The darkest portion of an image scanned as Color or Grayscale. When you click on the image with the Black-point eyedropper, all tones darker than the selected sample tones are adjusted to black. Brightness The overall amount of lightness or darkness in an image. An image with maximum brightness tends toward white; an image with minimum brightness tends toward black. While contrast refers to the range and number of tones in an image, brightness refers to the intensity of tones. Calibration Calibration refers to the adjustment of color processing for input and output devices on a computer, so that the colors match throughout the process. For example, calibration ensures that the color image scanned on a scanner matches the original image when it is displayed on the computer monitor, as well as printed on a color printer. Canon ColorGear Color Matching Canons process of matching the color profile of the input device (scanner) with the color profile of the output device (monitor), to yield the most accurate color image. Canon ImageTrust Canons process of converting grayscale image (8 bits per pixel) to a black and white image (1 bit per pixel) to yield a more effective scan for optical character recognition (OCR) applications. Channel See Color Channels.
88 Glossary Top Page Glossary Contents Index Clear button The button that removes the current image from the Preview Area. Color Channels The red, green, or blue components of a color image. Color images contain 8 bits per pixel each for red, green, and blue channels, therefore each pixel has 24 bits. If you are scanning a color image, you can change the brightness and contrast of the individual red, green, and blue tones in your image. The Master channel is a combination of the three. Color Matching The range of colors your scanner can see may not match the range of colors your video monitor can produce. Color matching lets your system display colors so that the color on your monitor and printer matches the colors scanned. See also Canon ColorGear Color Matching. Color Mode The type of scan used to scan an image, differentiated by the number of bits per pixel. ScanGear CS-U has the following Color Modes: Color(Photo), Color (Documents, Charts), Grayscale, Text Enhanced(OCR), and Black and White. Contrast Contrast refers to the difference between the lightest light and the darkest dark in the image. A low contrast value indicates that the difference between dark shades and light shades is not very great. A high value indicates a great difference between dark and light shades. While brightness refers to the intensity of tones in an image, contrast refers to the range and number of tones in an image.
89 Glossary Top Page Glossary Contents Index Crop The action of selecting part of an image. The Crop button on the ScanGear CS-U main window lets you select part of a preview image and re-preview or scan only that selected part. Curve chart The graph displayed in the Tone tab settings for the Auto Tone, Contrast/ Brightness, Gamma, Histogram, and Special Tone Curves features. This graph describes the relationship between the color characteristics of the previewed image and the available feature settings. Curve file A file containing Special Tone Curve settings. (Tone tab-Special Tone Curves) Custom curves A user-defined Special Tone Curve that may be saved in a file. (Tone tab- Special Tone Curves) Default The preset factory settings on hardware or software. Digitizing The process of converting an image into computer-usable (digital) information that can be saved as a file, printed, faxed, or otherwise manipulated on your computer. dpi The abbreviation for dots per inch. The resolution of a monitor or printer is measured in how many dots per horizontal inch it can display or print. See also Pixel, Optical resolution, Resolution.
90 Glossary Top Page Glossary Contents Index End points The points at each end of a preset or custom tone curve. The curve end points cannot be deleted. If they are dragged to or past an edge, they remain on the edge. Add points to the curve by clicking anywhere in the curve box. Executive A U.S. standard paper size measuring 7.25 x 10.5 in (184.2 x 266.7 mm) Eyedropper A Histogram tool used to sample the Black-point, Mid-point, and White- point areas in the previewed image. (Tone tab - Histogram) Full Platen The maximum scanning area on the scanners document glass, 216 x 297 mm (width of U.S. Letter and length of A4 paper sizes). Gamma Curve The Gamma Curve lets you change the midtones of colors to increase the contrast between colors, and enhance the overall image. When you increase the Gamma value, light colors are made lighter, and dark colors are made darker. The graphed curve represents the relationship between input and output values for the midtones of the preview image.