Advanced Scanning
Caution:
Changes made to a tone curve affect the image, so use caution when adjusting tone curves.
Curve Anchor
While the contrast control affects the extreme ends of the curve, the Gradation Curve dialog box provides an assortment of tools to control the entire range of tones.
To display an image’s tone curves, click the tone curve button 
. The Gradation Curves dialog box appears.
How To Use the Tone Curve
There are several ways to change the shape of a tone curve:
Click & Drag | As you move a curve anchor with |
| your mouse, the curve follows the |
| movement of the anchor. |
| To change a single anchor in the |
| curve without affecting the adjacent |
| anchors on the curve, “deactivate” |
| the adjacent anchors. |
| To deactivate an anchor, press and |
| hold the Alt key (on a PC) or the |
| Option key (on a Macintosh), then |
| click on the anchor. |
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