Canon printer PIXMA MG6821 User Manual

Correcting Images and Adjusting Colors with ScanGear (Scanner
Driver)
Correcting Images (Unsharp Mask, Reduce Dust and Scratches, Fading
Correction, etc.)
Adjusting Colors Using a Color Pattern
Adjusting Saturation and Color Balance
Adjusting Brightness and Contrast
Adjusting Histogram
Adjusting Tone Curve
Setting Threshold
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Correcting Images (Unsharp Mask, Reduce Dust and Scratches,Fading Correction, etc.)
The  Image Settings  functions on the  Advanced Mode  tab of ScanGear (scanner driver) allow you to
enhance the outline of the subjects, reduce dust/scratches, and correct faded colors when scanning images.
Setting Items
Click 
 (Arrow) of a function and select an item from the pull-down menu.
Important

Reducing show-through in text documents or lightening the base color inrecycled paper, newspapers, etc. when scanning documents
Set  Reduce Show-through  to ON .
OFFON
Sharpening slightly out-of-focus images
Set  Unsharp Mask  to ON .
OFFON
Reducing gradations and stripe patterns
Set  Descreen  to ON .
OFFON
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Note

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Adjusting Colors Using a Color PatternYou can preview color changes and reproduce natural colors by using the color pattern function in
ScanGear (scanner driver)'s  Basic Mode tab.
Color Adjustment
Correct colors that have faded with time or due to colorcast. "Colorcast" is a phenomenon where a
specific color affects the entire picture due to the weather or ambient strong colors.
Click an arrow in  Color Adjustment  to emphasize the corresponding color.
Cyan & red, magenta & green, and yellow...

Below is an example of correcting a bluish image.
Since  Blue and  Green  are too strong, click the  Yellow and Magenta  arrows to correct.
BeforeAfter
Note

Adjusting Saturation and Color BalanceYou can brighten colors that have faded with time or due to colorcast by using 
 (Saturation/Color
Balance) in ScanGear (scanner driver)'s  Advanced Mode tab.
Note

Move  (Slider) under Color Balance  to the left or right to emphasize the corresponding color.
Cyan & Red
Magenta & Green
Yellow & Blue
These are complementary color pairs (each pair produces a shade of gray when mixed). You can reproduce the natural colors of the scene by reducing the cast color and increasing the complementary color.
It is usually difficult to correct the image completely by adjusting only one color pair. It is recommended
that you find a portion in the image where it should be white,...

Adjusting Brightness and ContrastYou can adjust images that are too dark or bright, or too flat due to lack of contrast by using 
(Brightness/Contrast) in ScanGear (scanner driver)'s  Advanced Mode tab.
Note