Adobe Photoshop CS6, Руководство пользователя

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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 Adjustments panel (CS5) or the Properties panel (CS6).
Auto applies an automatic color correction using the current default setting. To change the default setting, choose Auto Options from the
Adjustment panel menu (CS5) or Properties panel menu (CS6) 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.
Add contrast to the midtones of a photo with Curves
If the image uses the full tonal range, but needs midtone contrast, Click the Curves icon in the Adjustments panel. Drag the curve into an S
shape.
Increasing the slope in the middle of the curve increases contrast in the midtones.
Keyboard shortcuts: Curves
You can use these keyboard shortcuts for Curves:
To set a point on the curve for the selected color in each color component channel (but not in the composite channel), Shift+Ctrl-click
(Windows) or Shift+Command-click (Mac OS) in the image.
To select multiple points, Shift-click points on the curve. Selected points are filled with black.
To deselect all points on the curve, click in the grid, or press Ctrl - D (Windows) or Command-D (Mac OS).
To select the next higher point on the curve, press the plus key; to select the next lowest, press the minus key.
To move selected points on the curve, press the arrow keys.
(Curves dialog box) To set a point on the curve for the current channel, Ctrl-click (Windows) or Command-click (Mac OS) in the image.
If you’re instead using the Curves adjustment, simply click in the image with the On-image adjustment tool .
For more information
Adjusting image color and tone in CS6