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Chapter 15 — Edit List | Develop Section 137
Quick Fix
Tone Curve
The Tone Curve tool provides you with a curve editor that
controls the tonality of the image. Within the Tone Curve
tool, you are presented with a curve that enables you to
control the relationship of input luminosity values to
output luminosity values.
Click anywhere on the curve to add an anchor point. Move
the anchor point to alter the relationship of input and
output values. Moving a point up makes objects of that
value brighter, while moving a point down makes objects
of that value darker. The curve is automatically adjusted to
ensure a smooth transition between each point added to
the image.
Anchor points can be removed by simply clicking and
dragging the anchor point outside of the curve editor or
by clicking on an anchor point to select it and pressing the
delete key.
The Tone Curve tool provides you with the following
additional controls:
❏ White and Black Output Slider
These two sliders enable you to set the maximum and
minimum brightness levels of the image. By dragging
the white output slider down, you darken the lightest
luminosity level in the image, and by dragging the black
output slider up, you lighten the darkest luminosity
level in the image. These two sliders are often used if the darkest and lightest colors in the image should
not be pure white (255, 255, 255) and pure black (0, 0, 0).
❏ Black Point Slider
Move the black point slider to the right to set all luminosity values from the point you have selected to
the left to complete black. This will redistribute all of the values to stretch the luminosity range to match
the entire possible range of values. It is recommended that you move the black point slider all the way
to the right to match up with the left-most information from the displayed histogram. This adjusts the
current image so that the darkest values in the image match the darkest value that can be displayed in
a digital file.
❏ Mid-Point Slider
Move the mid-point slider either to the left or to the right in order to lighten or darken the mid-tones of
the image.