Adobe Photoshop CC 2014 v.14.xx User Manual
Page 455
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Amount
Note:
Tonal Width
Radius
Brightness
Midtone Contrast
Black Clip And White Clip
Shadow/Highlight command options
Controls (separately for the highlight and shadow values in the image) how much of a correction to make.
Extreme Amount values may lead to a crossover, where what started as a highlight becomes darker than something that started as a
shadow; this can make the adjusted images look ‘unnatural’.
Controls the range of tones in the shadows or highlights that are modified. Smaller values restrict the adjustments to the darker
regions for shadow correction and the lighter regions for highlight correction. Larger values increase the range of tones that are adjusted further
into the midtones. For example, at 100% the shadow tonal width slider affects the shadows the most, the midtones are partially affected, but the
brightest highlights are not affected. Tonal width varies from image to image. Too large a value may introduce halos around dark or light edges.
The default settings attempt to reduce these artifacts. Halos may also occur when the Shadow or Highlight Amount values are too large.
Tonal Width is set to 50% by default. If you find that you are trying to lighten a dark subject but the midtones or lighter regions are changing too
much, try reducing Shadow Tone Width toward zero so that only the darkest regions are lightened. If, however, you want to brighten the
midtones as well as the shadows, increase Shadows Tonal Width toward 100%
Controls the size of the local neighborhood around each pixel. Neighboring pixels are used to determine whether a pixel is in the shadows
or highlights. Moving the slider to the left specifies a smaller area, and moving it to the right specifies a larger area. The optimum local
neighborhood size depends on the image. It’s best to experiment with the adjustment. If the radius is too large, the adjustment tends to brighten
(or darken) the whole image rather than brightening the subject only. It’s best to set the radius to roughly the size of the subjects of interest in the
image. Experiment with different Radius settings to obtain the best balance between subject contrast and differential brightening (or darkening) of
the subject compared to the background.
Adjusts the brightness in a grayscale image. This adjustment is available only for grayscale images. Moving the Brightness slider to
the left darkens a grayscale image, and moving the slider to the right lightens a grayscale image.
Adjusts the contrast in the midtones. Move the slider to the left to reduce the contrast and to the right to increase the contrast.
You can also enter a value in the Midtone Contrast box. A negative value reduces contrast, and a positive value increases contrast. Increasing
midtone contrast produces greater contrast in the midtones while tending to darken the shadows and lighten the highlights.
Specifies how greatly the shadows and highlights are clipped to the new extreme shadow (level 0) and highlight
(level 255) colors in the image. Larger values produce an image with greater contrast. Be careful not to make the clipping values too large,
because doing so reduces detail in the shadows or highlights (the intensity values are clipped and rendered as pure black or pure white).
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