Adjusting Image Quality Page 51
There are several ways to change the shape of a tone curve:
Click & drag As you drag a curve anchor, the curve follows the
movement of the anchor, but your adjustment to
one anchor doesn’t affect the other anchors.
To allow changes to a single anchor to affect the
adjacent anchors, you can activate the adjacent
anchors. Hold down the Alt key (Windows) or
option key (Macintosh) and click on the adjacent
anchor; the anchor turns white. Hold down the Alt
key (Windows) or option key (Macintosh) and click
the anchor again to deactivate it (it turns black).
Sliders Adjust the slider controls below the curve. See
Using the Tone Curve Sliders
for information on
adjusting the image with these sliders.
Numeric values Type a number (+ or –) in a tone value field; each
field adjusts an anchor point on the curve.
Adjusting Tone Curves of Individual Colors
When you first access the Gradation Curves dialog box for a color image,
all of the color channels are active. To modify the tone curve, either:
◗ Click the All Colors button to select all the RGB colors
◗ Click on a color button to select a specific color channel; the tone curve
line changes to that color
Then make your modifications as described in Using the Tone Curve
or
Using the Tone Curve Sliders.
curve anchor
All Colors button
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