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Chapter 13. Superimposing Clips > Using Multiply and Screen Keys

Using Multiply and Screen Keys

The multiply and screen options blend a clip with a clip in a lower track, based on luminance values taken from both clips. Multiply averages the product of the pixel values of the clip and the underlying image. The resulting image is darker than both, and never brighter than the original. Multiply preserves the black areas of the clip, while allowing the underlying image to show through the brighter areas (Figure 13.28). Screen uses inverse luminance values in its calculation. Therefore, the resulting image is brighter than either original image, and never darker than the clip to which it’s applied. Screen preserves white areas of the clip and allows the underlying image to show through darker areas (Figure 13.29). But the best way to understand these keys is to compare them.

Figure 13.28. Multiply makes the clip more transparent where the bright areas of the clip and the underlying image correspond. Here, the clouds show through where they overlap the statue’s highlights.



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