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The
tone curve is our tool for controlling the brightness of an image.
By mastering operation of [Tone curve], adjustment of image brightness and contrast is simple.
In the {pone curve・dialog box, the output (brightness after compensation) value over the input
value (original brightness) can be changed by adjusting the curve. Several different corrections
are possible with the tone curve. |
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Here, use the tone curve to correct a typical photograph. |
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This is the original image. Experiment
with the tone curve to improve the image.
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Initially, the tone curve is a straight
diagonal line. Grab the middle of the line with the mouse and lift it up a bit.
As you lift the curve, the image gets lighter. |
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Grab the middle of the line with the
mouse and lower it a bit.
This time the image gets darker. |
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It is also possible to adjust contrast
with {hevel compensation.・Contrast is improved because {hevel compensation・improves {^alance,・a
histogram, but adjustments that are impossible in {hevel compensation・are possible here.
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Two points of the tone curve can be
moved to form an ?S.・For example, if highlights are raised and shadows are lowered, an ?S・curve
is drawn. S-type compensation emphasizes highlights and darkens shadows. |
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Contrast, the difference between highlights
and shadows, is increased by the use of an ?S curve.・/font>
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This time, lower the highlight curve
and raise the shadow curve, effectively reducing the slope of the curve in the middle. |
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This is opposite from the method used
to increase contrast, so the contrast of the image is reduced.
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![These supplementary functions are used during retouching.]](../../images/reference/function/menu_photo_e.jpg)
