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36 DocuMate 250 Scanner Installation Guide
Curves
Like the Highlight/Shadow levels, the Curves feature also adjusts
the range of midtone colors on an image. However, with the Curves
feature you can set the gamma individually to adjust midtone levels
without losing details from the lightest or darkest areas.
To adjust the gamma curve:
1. Click the Curves button.
The dialog box that opens shows a plot of the gamma. The
gamma of the original image is represented by a straight line
from the lower left to upper right corners. Changing the straight
line to a curve changes the gamma setting for the midtones on
the original image.
2. From the Channel drop-down list, choose RGB to adjust the
gamma of all the channels, or choose a single channel if
available.
3. Drag the line up or down to set a new gamma.
The input and output values represent values on the horizontal
and vertical axes for the new gamma setting. Click the Curve
or Line button to see the display as a smooth curve or a line.
You can drag the line at multiple points.
4. Click Preview to see the effect of the changes on the preview
image.
5. Click Reset to reset the levels to their original values.
6. Click OK when the levels are what you want.
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