Canon printer PIXMA MG2920 white User Manual

							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
•
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 image. Decreasing contrast will decrease the
difference, thus softening the image.
Move 
 (Slider) under  Contrast to the left to decrease and right to increase the contrast of the image.
You can also enter a value (-127 to 127).
Decreased contrastOriginal imageIncreased contrast
Note
•
Increasing the contrast is effective in adding a three-dimensional feel to soft images. However, shadows and highlights may be lost if you increase the contrast too much.
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							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.
Green Adjust the Green channel.
Blue Adjust the Blue channel.
Note
•
Only  Grayscale  will be displayed in  Channel when Color Mode  is Grayscale .
Reading Histograms You can see the histogram of a specified area for each  Channel. The higher the histogram peak, the
more data is distributed to that level.
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							(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 between the black-point and white-
point.
•
All parts to the right of  (White-point Slider) will turn white (level 255).
When  Image Adjustment  is set to anything but  None, the adjustments shown below are performed
automatically.
Moving the Black-point and White-point SlidersMove the Black-point Slider or White-point Slider to adjust brightness.
Images with more data distributed to the highlight side
Move the Black-point Slider toward the highlight side.
Images with more data distributed to the shadow side
Move the White-point Slider toward the shadow side.
Images with widely distributed data
Move the Black-point Slider toward the highlight side, and White-point Slider toward the shadow side.
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							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.
•
The point clicked with  (Black-point Dropper) will be the darkest point. You can also enter a value
(0 to 245).
•
The point clicked with  (Mid-point Dropper) will be the middle of the tonal range. You can also
enter a value (5 to 250).
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							•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 Blue combined.
Red Adjust the Red channel.
Green Adjust the Green channel.
Blue Adjust the Blue channel.
Note
•
Only  Grayscale  will be displayed in  Channel when Color Mode  is Grayscale .
Reading Tone Curves With ScanGear, scanning images via a scanner is the input, and displaying to a monitor is the output.
"Tone Curve" shows the balance of tone input and output for each  Channel.
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							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.
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							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
•
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 to either black (0) or white (255). "Threshold" is
the borderline value that determines a color as black or white.
Move 
 (Slider) to the right to increase the threshold value and thus increase the black areas. Move the
slider to the left to decrease the value and thus increase the white areas. You can also enter a value (0 to
255).
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							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
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