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Adjust Image Colors
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Table of Contents
How To...
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To adjust image colors, in the Options Panel, click Adjustment
bar. The Adjustment tab will appear.
From the Adjustment tab, you can adjust the tonal range of an
image: |
- Brightness — you can make simple adjustments to the tonal range
of an image. Brightness setting determines the level of light and
dark shades in an image. A pure white image has maximum brightness,
whereas a pure black image has minimum brightness. Brightness is
distinct from contrast, which measures the range between the darkest
and lightest shades in an image.
- Contrast — you can make overall adjustment to the image.
Contrast setting determines the relationship between the light and
dark areas of an image. A high contrast image is a black and white
image with no gray shades. A low contrast image shows many midrange
gray shades. An image with low contrast tends to look dull and flat.
- Highlight — you can set highlight level for the whole
image. Increasing the highlight level value lightens the light areas
of your image, and decreasing the highlight value darkens them.
- Shadow — you can set shadow level for the whole image.
Increasing the shadow level value darkens the dark areas of your
image, and decreasing the shadow level lightens the dark areas of
your image.
- Gamma — you can set the contrast affecting the mid-level
grays or midtones of an image. Adjusting the image gamma
allows you to change brightness values of the middle range of gray
tones without altering the shadows and highlights.
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The adjustments of Brightness/Contrast, Highlight/Shadow
and Gamma levels are made separately to every available color
channel: |
- For color images scanned in 256
Colors or True Color, RGB mode, you can adjust
Brightness/Contrast and Gamma
levels for the Red, Green, Blue and RGB
channels; the adjustments to RGB channel affect each of the
Red, Green and Blue channels. You can adjust Highlight/Shadow levels for the RGB channel only.
- For the images scanned in Gray 256
Scales mode, you can adjust
Brightness/Contrast, Highlight/Shadow and Gamma
levels for the Gray channel only.
- For the images scanned in
Lineart B/W or Halftone B/W mode, you cannot adjust any of the
Brightness/Contrast,
Highlight/Shadow and Gamma settings.
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To make adjustments for a color channel, select the channel in the
Channel
list: |
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To do the following…
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In the Channel list, click the following item:
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Adjust Brightness/Contrast and Gamma levels for the Red color
channel |
Red |
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Adjust Brightness/Contrast and Gamma levels for the Green color
channel |
Green |
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Adjust Brightness/Contrast and Gamma levels for the Blue color
channel |
Blue |
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Adjust Brightness/Contrast,
Highlight/Shadow and Gamma levels for the RGB color
channel |
RGB |
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Adjust Brightness/Contrast,
Highlight/Shadow and Gamma levels for the Gray color
channel |
Gray |
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You can use automatic color adjustment. When automatic adjustment is applied,
ScanThru automatically sets the
Brightness/Contrast, Highlight/Shadow and
Gamma levels for all color channels. To adjust the
Brightness/Contrast, Highlight/Shadow and
Gamma levels for all color channels automatically, click Auto. |
You can also apply color inversion to the image. To invert the image colors,
select the Invert check box. When you invert image colors, all
image color values are changed to the opposite ones (for example, black
color is changed to white). |
The color inversion that is applied to the image uses the current
Brightness/Contrast, Highlight/Shadow and Gamma
level settings. |
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Related Topics:
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