Canon printer PIXMA MG6620 User Manual

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
•
Click  (Down arrow) to switch to detailed view. Click  (Up arrow) to return to the previous view.
•
Click Defaults  to reset all adjustments in the current window.
Channel Each dot of an image is a mixture of Red, Green, and Blue in various proportions (gradation). These
colors can be adjusted...

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
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Highlights may be lost if you brighten the image too much, and shadows may be lost if you darken the image too much.
Contrast "Contrast" is the degree of difference between the brighter and darker parts of an image. Increasing
contrast will increase the difference, thus sharpening the...

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
•
Click Defaults  to reset all adjustments in the current window.
Channel Each dot of an image is a mixture of Red, Green, and Blue in various proportions (gradation). These
colors can be adjusted individually as a "channel."
Master Adjust the Red, Green, and Blue combined.
Red Adjust the Red channel....

(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.
•
All parts to the left of  (Black-point Slider) will be black (level 0).
•
The parts at  (Mid-point Slider) will turn to the color exactly...

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...

•The point clicked with  (White-point Dropper) will be the brightest point. You can also enter a
value (10 to 255).•
Click  (Dropper) for  Gray Balance  and click the area you want to adjust the color in the preview
image.
The clicked point will be set as the achromatic color reference, and the rest of the image is adjusted
accordingly. For instance, if snow in a photo appears bluish, click the bluish part to adjust the whole image and reproduce natural colors.
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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
•
Click  Defaults  to reset all adjustments in the current window.
Channel Each dot of an image is a mixture of Red, Green, and Blue in various proportions (gradation). These
colors can be adjusted individually as a "channel."
Master Adjust the Red, Green, and...

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...

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
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This function is available when  Color Mode is Black and White .
•
Click Defaults  to reset all adjustments in the current window.
Adjusting Threshold The brightness of color and grayscale images is expressed in a value between 0 and 255. However, in
creating black and white images, all colors are mapped...