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By selecting individual color channels on the tone curve, adjustments to the overall color of an
image can be made. This can be used to eliminate unnatural color casts or add warmth to a pic-
ture.
If the image is too red, green, or blue,
simply drag the corresponding color-
channel curve down until the color
appears natural. If the color cast is pre-
dominantly one of the secondary colors,
cyan, magenta, or yellow, move the
curve of the complementary color up.
For example, if the image is too yellow,
move the blue curve up, see the color
example on page 2. For more on com-
plementary colors, see page 90 and 91.
Increasing image contrast
The contrast of an image can be changed. The light blue
45° line on the tone-curve graph represents the original
contrast of the image. Making the angle of the tone curve
greater than 45° will increase the contrast. Making the
angle less than 45° will reduce the contrast.
With the RGB channel selected, click on
the tone curve near the top and bottom
to add two nodes. Slightly move the top
node up and the bottom node down. This
will increase the angle of the central por-
tion of the tone curve and increase the
contrast of the image without making an
overall change in image brightness.
Correcting color
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