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Chapter 12. More Layer Techniques > Preserving Underlying Transparency

Preserving Underlying Transparency

To the right of the Mode menu is a layer switch in a column marked simply “T.” This innocuous-looking little T switch performs an important function: It preserves the underlying transparency. When you select this option, the opaque areas of a layer display only where they overlap with opaque areas in the underlying image (Figure 12.44 and Figure 12.45). The Preserve Transparency option is commonly used to make it appear as though light is being reflected from the surface of the underlying solid. You can use Preserve Transparency in conjunction with any Layer mode or track matte. When you activate it, the Video switch becomes a darkened Eye icon .

Figure 12.44. When composited without Preserve Transparency selected, the entire highlight is superimposed over the underlying image.



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