ADOBE PREMIERE PRO 2.0
User Guide
320
Multiply Key effect
The Multiple Key effect multiplies the color values in a clip image with the underlying clip, and divides the result by
255 (the maximum pixel value of 8-bit pixels). The resulting color is never brighter than the original.
See also
“Multiply Key and Screen Key” on page 363
Non Red Key effect
The Non Red Key effect makes the clip’s non-red (blue or green) pixels transparent.
See also
“Using the Non Red Key” on page 362
RGB Difference Key effect
The RGB Difference Key effect creates transparency by removing pixels from a specified color or range of colors.
Select a key color by clicking the Color swatch or by dragging the eyedropper to a color in the Monitor window.
See also
“Using the RGB Difference Key” on page 361
Remove Matte effect
The Remove Matte effect removes color fringes from clips that are premultiplied with a color. It is useful when
combining alpha channels with fill textures from separate files. If you import footage with a premultiplied alpha
channel, or if you create alpha channels with After Effects, you may need to remove halos from an image. Halos are
caused by a large contrast between the image's color and the background, or matte, color. Removing or changing the
color of the matte can remove the halos.
Use Background Color to specify the new background color when you want to change the color of a matte.
Screen Key effect
The Screen Key effect multiplies the inverse brightness values of the clip’s colors with that of the image produced by
clips in lower tracks. The resulting color is never darker than the original. Using the Screen option is similar to the
traditional technique of superimposing two different film negatives and printing the result.
See also
“Multiply Key and Screen Key” on page 363
Track Matte Key effect
The Track Matte Key effect creates transparent areas in a clip that correspond to the luminance levels of another clip.
Transparent areas reveal the image produced by clips in lower tracks. Exclude the matte clip from the output by
selecting the clip and choosing Clip > Enable.