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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 picture.
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 predominantly 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. For more on color, see page 35.
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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 of the image. Making the angle less than
45° will reduce the contrast.
Increasing 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
portion of the tone curve and increase the contrast of the image without making an overall change in
image brightness.
Correcting color