Canon scanner CanoScan N650U User Manual

81 chapter 7
Troubleshooting
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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,...

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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,...

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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...

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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...

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Glossary 

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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...

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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...

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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...

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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...

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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...