Canon scanner CanoScan LiDE 220 User Manual

							141 
						

							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 & blue 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 recommended that you find a portion in the image where it should be white, and adjust the colors sothat the portion turns white.
142 
						

							Preview image appears in the center. Preview image colors change as you adjust them.
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
•
Color adjustments are applied only to the cropping frames (scan areas) or the frame selected in
thumbnail view.
•
You can select multiple frames or cropping frames by clicking them while pressing the Ctrl key.
•
You can also select a color tone from the color pattern displayed on the left of the  Color Pattern
screen.
•
You can also use this function to add a specific tint to an image. Increase the magenta to add a warm tint, and increase the blue to add a cool tint.
143 
						

							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
•
Click Defaults  to reset all adjustments in the current window.
Saturation Adjust the image's saturation (vividness). You can brighten colors that have faded with time, etc.
Move 
 (Slider) under  Saturation to the left to decrease the saturation (darken the image), and to the
right to increase the saturation (brighten the image). You can also enter a value (-127 to 127).
Saturation decreasedOriginal imageSaturation increased
Note
•
The natural color tone of the original image may be lost if you increase saturation too much.
Color Balance Adjust images that have a colorcast. "Colorcast" is a phenomenon where a specific color affects the entire
picture due to the weather or ambient strong colors.
144 
						

							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, and adjust all three color pairs so that the
portion turns white.
You can also enter a value (-127 to 127). Below is an example of an image in which the "Cyan & Red" pair has been adjusted.Cyan is increasedRed is increased
145 
						

							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 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 .
146 
						

							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.
147 
						

							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.
148 
						

							(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.
149 
						

							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).
150