Digital Research Technologies DRSCAN36EPPR - Manual (Page 19)

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the image even lighter, drag the Highlight scroll box to the
left.
3. To return to the original value (no adjustment), click on the
Reset button.
If you have scanned a color image, you may change the values for
each color separately by using the appropriately colored buttons at
the top of the screen.
The Descreen Button
The Descreen button, at the lower left hand corner of the Preview
Window, smooths scans and prevents a screen-like effect without
changing the resolution or increasing the image size.
To activate the Descreen button, click on it.
The Auto Levels Button
The Auto Levels button is at the bottom right hand corner of the
Preview Window. Clicking on the Auto Levels button changes the
settings to the document to the default settings your scanner
The Gamma Curve
When you adjust the gamma curve, you make adjustments to the
middle range of tones in the image, and the shadow and highlight
remain relatively unaffected.