S T E P 3
To Edit the Tone Curve
[ 
] Click the [Gamma] button.
The Color Correction dialog box opens.
Click the radio button for Tone Curve and adjust the gamma setting.
|
|
|
| You can adjust the setting for each channel: R (red), G | |||||
|
|
|
| (green), B (blue) or M (RGB or grayscale). You can adjust | |||||
Radio button | each channels independently. (You can adjust RGB only for | ||||||||
a high definition color image.) | |||||||||
|
|
|
|
|
|
|
|
| Resets the gamma curve to |
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
| a straight line. |
|
|
|
|
|
|
|
|
| Shows the input and output |
|
|
|
|
|
|
|
|
| level at the point under the |
|
|
|
|
|
|
|
|
| pointer (control point) in |
|
|
|
|
|
|
|
|
| the graph, expressed as a |
|
|
|
|
|
|
|
|
| value from 1 to 255 where |
|
|
|
|
|
|
|
|
| 1 is the darkest and 255 the |
|
|
|
|
|
|
|
|
| lightest. [ I ] is for input and |
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
| [O] is for output. If the |
|
|
|
|
|
|
|
|
| output level is larger than |
|
|
|
|
|
|
|
|
| the input level, this results |
|
|
|
|
|
|
|
|
| in a lighter image. |
|
|
|
|
|
|
|
|
|
|
To create a control point on the line, just click any location on the line. After a control point is displayed in the line you can drag it in any direction. As you drag it to another location, the gamma value changes. You can set several control points on the gamma curve.
Click the [OK] button.
The image in the preview window changes to reflect the new settings.
Hint
You can also open this dialog box by pulling down the Image menu in the operation panel and selecting Color Correction.
45 
