Adobe Photoshop CC 2014 v.14.xx - Manual (Page 450)

Note:
To remove a control point, do any of the following:
Drag the control point off the graph.
Select the control point and press Delete.
Ctrl-click (Windows) or Command-click (Mac OS) the control point.
Set Curve display options
You can control the curve grid display using the Curve display options.
1. Apply a Curves adjustment.
2. In the the Properties panel (CC, CS6) or the Adjustments panel (CS5), choose Curves Display Options from the panel menu.
If you chose Image > Adjustments > Curves, expand the Curve Display Options in the Curves dialog box.
3. In the Curves Display Options dialog box, select any of the following:
Light (0-255) Displays the intensity values for RGB images in a range from 0 to 255, with black (0) at the lower-left corner.
Pigment/Ink % Displays the percentages for CMYK images are displayed in a range from 0 to 100, with highlights (0%) at the lower-left
corner.
Simple Grid Displays gridlines in 25% increments.
Detailed Grid Displays gridlines in 10% increments.
Show Channel Overlays Displays color channel curves superimposed on the composite curve.
Histogram Displays a histogram of the original image tonal values behind the graph.
Baseline Displays the original image color and tonality as a 45-degree angle line for reference,
Intersection Line Displays horizontal and vertical lines to help you align control points as your drag them relative to the histogram or grid.
To change the gridline increment, Alt-click (Windows) or Option-click (Mac OS) the grid.
Apply an Auto correction in Curves
Click Auto in the Properties panel (CC, CS6) or the Adjustments panel (CS5).
Auto applies an automatic color correction using the current default setting. To change the default setting, choose Auto Options from the
Properties panel menu (CC, CS6) or the Adjustment panel menu (CS5) and set the options in the Auto Color Correction Options dialog box. You
can apply an Auto Color, Auto Contrast, or Auto Tone correction to an image. For more information on these options, see
Set Auto adjustment
options .
Set black and white points using the black point and white point sliders
When applying a Curves adjustment, use the black and white sliders to quickly set the black and white points (pure black and pure white values) in
the image.
1. Drag the black and white point sliders to any point along the horizontal axis. Note that the Input value changes as your drag.
2. To preview clipping as you adjust black and white points, do one of the following:
Hold down Alt (Windows) or Option (Mac OS).
Choose Show Clipping For Black/White Points from the panel menu.
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