Adobe 13102498 - Photoshop CS3 - Mac User Manual page 179

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 towards zero so that only the darkest regions
are lightened. If, however, you need 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
Radius
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 exper-
iment 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.
Allows fine-tuning of the colors in regions of the image that have changed. This adjustment is
Color Correction
available only in color images. For example, by increasing the setting of the Shadows Amount slider, you bring out
colors that were dark in the original image. You may want these colors to be more vivid or less vivid. Adjust the Color
Correction slider to achieve the best results. In general, increasing the values tends to produce colors that are more
saturated, and decreasing the values produces colors that are less saturated.
Note: Because the Color Correction slider affects only changed portions of the image, the amount of color variation
depends on how much shadow or highlight is applied. The greater the correction of shadows and highlights, the greater
the range of color correction available. The Color Correction slider exerts subtle control over the darkened or lightened
colors in the image. If you want to change the color hues or saturation of the whole image, use the Hue/Saturation
command after applying the Shadow/Highlight command.
Adjusts the brightness in a grayscale image. This adjustment is available only for grayscale images.
Brightness
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
Midtone Contrast
right to increase the contrast. You can also enter a value in the Midtone Contrast text 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.
Black Clip And White Clip
(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).
Add contrast to a photo
You can add contrast to an image in two ways, depending on the problem.
If the image needs overall contrast because it doesn't use the full tonal range, choose Image > Adjustments > Levels.
Then drag the Shadow and Highlight input sliders inward until they touch the ends of the histogram.
Specifies how greatly the shadows and highlights are clipped to the new extreme shadow
PHOTOSHOP CS3 172
User Guide