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Canon printer PIXMA MG6821 User Manual

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    							Brightness
    Adjust the image brightness.
    Move 
     (Slider) under  Brightness to the left to darken and right to brighten the image. You can also
    enter a value (-127 to 127).
    DarkenedOriginal imageBrightened
    Note
    
    						
    							Adjusting HistogramYou can adjust the image color tone by using a graph (histogram) showing brightness distribution, via 
    (Histogram) in ScanGear (scanner driver)'s  Advanced Mode tab.
    Note
    
    						
    							(1) Bright area(2) Dark area(3) Whole imageMore data is distributed to thehighlight side.More data is distributed to the shadow side.Data is widely distributed between thehighlight and shadow.
    Adjusting Histograms (Using the Slider)
    Select a  Channel , then move 
     (Black-point Slider) or  (White-point Slider) to specify the level to be
    set as the shadow or highlight.
    
    						
    							Moving the Mid-point SliderMove the Mid-point Slider to specify the level to be set as the middle of the tonal range.
    Images with more data distributed to the highlight side
    Move the Mid-point Slider toward the highlight side.
    Images with more data distributed to the shadow side
    Move the Mid-point Slider toward the shadow side.
    Adjusting Histograms (Using the Droppers)
    When you select a  Channel and click the Black-point, Mid-point, or White-point Dropper, the mouse
    pointer on the preview image changes to a dropper. Click a Dropper displayed below the histogram to
    change the setting.
    
    						
    							Adjusting Tone CurveYou can adjust the brightness of an image by selecting the type of graph (tone curve) showing the balance
    of tone input and output, via 
     (Tone Curve Settings) in ScanGear (scanner driver)'s  Advanced Mode
    tab.
    Note
    
    						
    							Adjusting Tone Curve
    In  Select Tone Curve , select a tone curve from  No correction, Overexposure , Underexposure , High
    contrast , Reverse the negative/positive image , and Edit custom curve .
    No correction (No adjustment)
    Overexposure (Convex curve)
    The midtone data of the input side is stretched toward the highlight of the output side, resulting in a bright-
    toned image when viewed on a monitor.
    Underexposure (Concave curve)
    The midtone data of the input side is stretched toward the shadow of the output side, resulting in a dark-
    toned image when viewed on a monitor.
    High contrast (S curve)
    The highlight and shadow of the input side are enhanced, resulting in a high-contrast image.
    Reverse the negative/positive image (Downward-sloping line)
    The input and output sides are reversed, resulting in a negative-positive inverted image.
    737 
    						
    							Edit custom curve
    You can drag specific points on the Tone Curve to freely adjust the brightness of the corresponding areas.
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    							Setting ThresholdYou can sharpen text in a document or reduce show-through in newspapers by adjusting the threshold level
    via 
     (Threshold) in ScanGear (scanner driver)'s  Advanced Mode tab.
    Note
    
    						
    							ScanGear (Scanner Driver) Screens
    Basic Mode Tab
    Advanced Mode Tab
    Input Settings
    Output Settings
    Image Settings
    Color Adjustment Buttons
    Preferences Dialog Box
    Scanner Tab
    Preview Tab
    Scan Tab
    Color Settings  Tab
    740 
    						
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