You 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.
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 Sliders
Move 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.
Moving the Mid-point Slider
Move 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.
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