Adobe 65021048 User Guide - Page 311
Channel effects, Arithmetic effect, Blend effect
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ADOBE PREMIERE PRO CS3 305 User Guide 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. 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. 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 by selecting the clip and choosing Clip > Enable. Blend With Layer The clip to blend with (the secondary or control layer). Mode Blending 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 the original image out 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 doesn't show through. If Layer Sizes Differ Specifies how to position the control layer. April 1, 2008