User manual

Image Effects
Page 19
5.2.2 Correct Gradation Curve
You can correct the exposure of the image with Nero PhotoSnap. The gradation curve
defines the distribution of the brightness values. On the X axis are the hue values of the
original from light to dark, on the X axis the hue values after the correction from light to dark.
A straight curve with a 45° angle means that the original values remain unchanged.
The following prerequisite must be met:
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The Exposure area is displayed.
To correct the gradation curve, proceed as follows:
1. Click the Gradation curves tab.
Æ The Gradation curves tab is displayed.
2. To prevent a distortion of the brightness ranges that should not be changed, click the curve.
Æ A control point is set.
Fig. 4: Exposure area, Gradation curves tab -- drawn gradation curves with control points
3. Pull the curve upward or downward to lighten or darken the hue values of this area.
4. Click the Apply button.
Î You have adjusted the exposure. The histogram of the edited image then shows a
changed profile.
If you are not satisfied with the change, you can reset to the default value with the Reset
button.