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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.
