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Effects and transitions

Ghosting effect (Windows only)

The Ghosting effect overlays transparencies of the immediately preceding frames on the current frame. This effect can be useful, for example, when you want to show the motion path of a moving object, such as a bouncing ball. Keyframes cannot be applied to this effect.

Sharpen effect

The Sharpen effect increases the contrast where color changes occur.

Unsharp Mask effect

The Unsharp Mask effect increases the contrast between colors that define an edge.

Original (left), and with effect applied (right)

Radius The distance from the edge at which pixels are adjusted for contrast. If you specify a low value, only pixels near the edge are adjusted.

Threshold The greatest difference between adjacent pixels for which contrast isn’t adjusted. A lower value produces a greater result. A value that is too low causes an adjustment to the contrast of the entire image. A low value can also generate noise or cause unexpected results.

Channel effects

Arithmetic effect

The Arithmetic effect performs various simple mathematical operations on an image’s red, green, and blue channels.

Operator The operation to perform between the value you specify for each channel and the existing value of that channel for each pixel in the image:

•And, Or, and Xor Apply bitwise logical operations.

•Add, Subtract, Multiply, and Difference Apply basic math functions.

•Max Set the pixel’s channel value to the greater of the specified value and the pixel’s original value.

•Min Set the pixel’s channel value to the lesser of the specified value and the pixel’s original value.

•Block Above Set the pixel’s channel value to 0 if the pixel’s original value is greater than the value specified; otherwise, leave the original value.

•Block Below Set the pixel’s channel value to 0 if the pixel’s original value is less than the value specified; otherwise, leave the original value.

•Slice Set the pixel’s channel value to 1.0 if the pixel’s original value is above the specified value; otherwise, set the value to 0. In both cases, the values for the other color channels are set to 1.0.

•Screen Apply a screen.

Clip Result Values Prevents all functions from creating color values that exceed the valid range. If this option isn’t selected, some color values may wrap around.

Last updated 1/16/2012

USING ADOBE PREMIERE PRO

350

Effects and transitions

Blend effect

The Blend effect blends two clips using one of five modes. After you blend clips using this effect, disable the clip you selected from the Blend With Layer menu. Select the clip and choose Clip > Enable.

Blend With Layer The clip to blend with (the secondary or control layer).

Mode Blend mode:

•Color Only colorizes each pixel in the original image based on the color of each corresponding pixel in the secondary image.

•Tint Only is similar to Color Only but tints pixels in the original image only if they are already colored.

•Darken Only darkens each pixel in the original image that is lighter than the corresponding pixel in the secondary image.

•Lighten Only lightens each pixel in the original image that is darker than the corresponding pixel in the secondary image.

•Crossfade fades out the original image while the secondary image fades in.

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 does not show through.

If Layer Sizes Differ Specifies how to position the control layer.

Calculations effect

The Calculations effect combines the channels of one clip with the channels of another clip.

Original images (left and center), and with effect applied (right)

Input Channel The channel to extract and use as input to the blending operation. RGBA displays all channels normally. Gray converts all color channel values for a pixel to the luminance value of the original pixel. Red, Green, or Blue converts all color channel values for a pixel to the value of the selected color channel for the original pixel. Alpha converts all channels to the value of the alpha channel for the original pixel.

For instructions on using the Calculations effect and the Ramp effect, see Coloring A Washed-out Sky With A Gradient In Premiere Pro CS by Jeff Schell.

Invert Input Inverts the clip before the effect extracts the specified channel information.

Second Layer The video track with which Calculations blends the original clip.

Second Layer Channel The channel to be blended with the input channels.

Second Layer Opacity The opacity of the second video track. Set to 0% for the second video track to have no influence on the output.

Invert Second Layer Inverts the second video track before the effect extracts the specified channel information.

Last updated 1/16/2012

USING ADOBE PREMIERE PRO

351

Effects and transitions

Stretch Second Layer To Fit Stretches the second video track to the dimensions of the original clip before blending. Deselect this option to center the second video track on the original clip.

Preserve Transparency Ensures that the original layer’s alpha channel isn’t modified.

Compound Arithmetic effect

The Compound Arithmetic effect mathematically combines the clip to which it’s applied with a control layer. The Compound Arithmetic effect is intended only to provide compatibility with projects created in earlier versions of After Effects that use the Compound Arithmetic effect.

Second Source Layer Specifies the video track to use with the current clip in the given operation.

Operator Specifies the operation to perform between the two clips.

Operate On Channels Specifies the channels to which the effect is applied.

Overflow Behavior Specifies how pixel values that exceed the allowed range are treated:

•Clip Indicates that the values are limited to the allowed range.

•Wrap Indicates that values exceeding the allowed range wrap around from full on to full off, or from full off to full on.

•Scale Indicates that the maximum and minimum values are calculated and the results are stretched down from that full range to the range of allowable values.

Stretch Second Source To Fit Scales the second clip to match the size (width and height) of the current clip. If this option is deselected, the second clip is placed at its source’s current size, aligned with the upper left corner of the source clip.

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 does not show through.

Invert (video) effect

The Invert (video) effect inverts the color information of an image.

Channel Which channel or channels to invert. Each group of items operates in a particular color space, inverting either the entire image in that color space or just a single channel.

•RGB/Red/Green/Blue RGB inverts all three of the additive color channels. Red, Green, and Blue each invert an individual color channel.

•HLS/Hue/Lightness/Saturation HLS inverts all three of the calculated color channels. Hue, Lightness, and Saturation each invert an individual color channel.

•YIQ/Luminance/In Phase Chrominance/Quadrature Chrominance YIQ inverts all three NTSC luminance and chrominance channels. Y (luminance), I (in-phase chrominance), and Q (quadrature chrominance) each invert an individual channel.

•Alpha Inverts the alpha channel of the image. The alpha channel isn’t a color channel; it specifies transparency.

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.

Last updated 1/16/2012