S T E P 4

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.

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