Adobe Premiere Pro CS6 - Manual (Page 393)

Extract effect
The Extract effect removes colors from a video clip, creating a grayscale image. Pixels with luminance values less than the Black Input Level or
greater than the White Input Level are made black. Everything between those points will appear gray or white.
Note: The controls for this effect are similar to those of the Extract effect in Adobe After Effects, but the purpose and results of the effect are
different.
Levels effect
The Levels effect manipulates the brightness and contrast of a clip. It combines the functions of the Color Balance, Gamma Correction, Brightness
& Contrast, and Invert effects. This effect functions much the same as the Levels effect in After Effects.
The Levels Settings dialog box displays a histogram of the current frame (Windows only).
Lighting Effects effect
The Lighting Effects effect applies lighting effects on a clip with up to five lights to introduce creative lighting. Lighting Effects lets you control
lighting properties such as lighting type, direction, intensity, color, lighting center, and lighting spread. There is also a Bump Layer control to use
textures or patterns from other footage to produce special lighting effects such as a 3D-like surface effect.
See examples of using this effect in this video tutorial .
ProcAmp effect
The ProcAmp effect emulates the processing amplifier found on standard video equipment. This effect adjusts the brightness, contrast, hue,
saturation, and split percent of a clip's image.
Shadow/Highlight effect
The Shadow/Highlight effect brightens shadowed subjects in an image and reduces the highlights in an image. This effect doesn’t darken or
lighten an entire image; it adjusts the shadows and highlights independently, based on the surrounding pixels. You can also adjust the overall
contrast of an image. The default settings are for fixing images with backlighting problems.
Richard Harrington provides a video tutorial on the Creative COW website that demonstrates the use of the Shadow/Highlight effect.
Auto Amounts If this option is selected, the Shadow Amount and Highlight Amount values are ignored, and automatically determined amounts
are used that are appropriate for lightening and restoring detail to the shadows. Selecting this option also activates the Temporal Smoothing
control.
Shadow Amount The amount to lighten shadows in the image. This control is active only if you deselect Auto Amounts.
Highlight Amount The amount to darken highlights in the image. This control is active only if you deselect Auto Amounts.
Temporal Smoothing The range of adjacent frames, in seconds, analyzed to determine the amount of correction needed for each frame, relative
to its surrounding frames. If Temporal Smoothing is 0, each frame is analyzed independently, without regard for surrounding frames. Temporal
Smoothing can result in smoother looking corrections over time.
Scene Detect If this option is selected, frames beyond a scene change are ignored when surrounding frames are analyzed for temporal
smoothing.
Blend With Original The effect’s transparency. The result of the effect is blended with the original image, with the effect result composited on top.
The higher you set this value, the less the effect affects the clip. For example, if you set this value to 100%, the effect has no visible result on the
clip; if you set this value to 0%, the original image doesn’t show through.
Expand the More Options category to reveal the following controls:
Shadow Tonal Width and Highlight Tonal Width The range of adjustable tones in the shadows and highlights. Lower values restrict the
adjustable range to only the darkest and lightest regions, respectively. Higher values expand the adjustable range. These controls are useful for
isolating regions to adjust. For example, to lighten a dark area without affecting the midtones, set a low Shadow Tonal Width value so that when
you adjust the Shadow Amount, you are lightening only the darkest areas of an image. Specifying a value that is too large for a given image might
introduce halos around strong dark to light edges. The default settings attempt to reduce these artifacts. They can be further reduced by
decreasing these values.
Shadow Radius and Highlight Radius The radius (in pixels) of the area around a pixel that the effect uses to determine whether the pixel
resides in a shadow or a highlight. Generally, this value should roughly equal the size of the subject of interest in your image.
Color Correction The amount of color correction that the effect applies to the adjusted shadows and highlights. For example, if you increase the
Shadow Amount value, you bring out colors that were dark in the original image; you may want these colors to be more vivid. The higher the Color
Correction value, the more saturated these colors become. The more significant the correction that you make to the shadows and highlights, the
greater the range of color correction available.
Note: If you want to change the color over the whole image, use the Hue/Saturation effect after applying the Shadow/Highlight effect.
Midtone Contrast The amount of contrast that the effect applies to the midtones. Higher values increase the contrast in the midtones alone, while
concurrently darkening the shadows and lightening the highlights. A negative value reduces contrast.
Black Clip, White Clip How much of the shadows and highlights are clipped to the new extreme shadow and highlight colors in the image. Be
careful of setting the clipping values too large, as doing so reduces detail in the shadows or highlights. A value between 0.0% and 1% is
recommended. By default, shadow and highlight pixels are clipped by 0.1%—that is, the first 0.1% of either extreme is ignored when the darkest
and lightest pixels in the image are identified. These are then mapped to output black and output white, ensuring that input black and input white
values are based on representative rather than extreme pixel values.
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