Adobe Premiere Pro CS4 - Manual (Page 346)

340 USING ADOBE PREMIERE PRO CS4
Effects and transitions
Last updated 11/6/2011
Constant Power transition
The Constant Power crossfade creates a smooth, gradual transition, analogous to the dissolve transition between video
clips. This crossfade decreases audio for the first clip slowly at first and then quickly toward the end of the transition.
For the second clip, this crossfade increases audio quickly at first and then more slowly toward the end of the
transition.
Exponential Fade transition
Exponential Fade fades out the first clip over a smooth logarithmic curve while fading up the second clip, also over a
smooth logarithmic curve. Selecting an option from the Alignment control menu, you can specify the positioning of
the transition.
More Help topics
“ Work with audio transitions ” on page 220
“ Fade in or fade out clip audio ” on page 221
Adjust effects
Auto Color, Auto Contrast, and Auto Levels effects
The Auto Color, Auto Contrast, and Auto Levels effects make quick global adjustments to a clip. Auto Color adjusts
contrast and color by neutralizing the midtones and clipping the white and black pixels. Auto Contrast adjusts the
overall contrast and mixture of colors, without introducing or removing color casts. Auto Levels automatically corrects
the highlights and shadows. Because Auto Levels adjusts each color channel individually, it may remove or introduce
color casts.
Each effect has one or more of the following settings:
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 the effect analyzes surrounding
frames for temporal smoothing.
Snap Neutral Midtones (Auto Color only) Identifies an average nearly neutral color in the frame and then adjusts the
gamma values to make the color neutral.
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;
those pixels are then mapped to output black and output white. This clipping ensures that input black and input white
values are based on representative rather than extreme pixel values.
Blend With Original Determines 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.